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{{T}}
[[Category:English]]
[[Category:Human Digestion and Nutrition]]

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= Introduction =

Every bite of food starts a journey through your body. Your [[English:Digestive system|digestive system]] breaks food into smaller parts, moves useful [[English:Nutrient|nutrient]]s into your body, takes in water, and removes material your body cannot use. [[English:Nutrition|Nutrition]] is about the substances in food that help you get energy, grow, repair tissues, and keep body processes working well.

In this aiMOOC, you will follow food from the mouth to the anus, discover how organs work together, compare major nutrients, and practise making balanced food choices. The course is designed for Grades 5–6, so scientific words are introduced step by step.

[[File:Digestive system diagram en.svg|500px|frameless|center]]

'''Learning goals:''' By the end of the course, you should be able to explain the route food takes, describe mechanical and chemical digestion, identify important nutrients and their roles, explain where most nutrients and water are absorbed, and use nutrition ideas to plan a varied meal.

The digestive system is more than a stomach. It includes a long tube called the gastrointestinal tract, or GI tract, plus organs such as the liver, gallbladder, and pancreas that send helpful substances into the tract. The GI tract includes the mouth, esophagus, stomach, small intestine, large intestine, rectum, and anus. Reliable medical information from the U.S. National Institute of Diabetes and Digestive and Kidney Diseases explains that digestion breaks food into parts small enough for the body to absorb and use. [https://www.niddk.nih.gov/health-information/digestive-diseases/digestive-system-how-it-works NIDDK: Your Digestive System and How It Works]

{{#ev:youtube|https://www.youtube.com/watch?v=ZBZWgrfZFbU|500|center}}

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= The Journey of Food =

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== Mouth: The Starting Point ==

Digestion begins in your [[English:Mouth|mouth]]. Your teeth cut, tear, crush, and grind food. This is '''mechanical digestion''' because the food is physically broken into smaller pieces. Your tongue moves food around and helps form a soft lump that is easier to swallow.

[[File:Human tooth diagram-en.svg|450px|frameless|center]]
''Image credit: K. D. Schroeder, Human tooth diagram-en.svg, [https://creativecommons.org/licenses/by-sa/4.0/ CC BY-SA 4.0], via Wikimedia Commons.''

Salivary glands make [[English:Saliva|saliva]]. Saliva wets food so it is easier to move. It also contains an enzyme called amylase that begins the chemical digestion of some starches. This is an example of '''chemical digestion''': substances such as enzymes change large food molecules into smaller ones.

Try thinking about a plain cracker. As you chew it, your teeth make smaller pieces, while saliva mixes with it. Two kinds of digestion are happening at the same time.

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== Esophagus: Moving Food Down ==

After you swallow, food enters the [[English:Esophagus|esophagus]], a muscular tube leading to the stomach. Muscles in its wall squeeze in a wave-like pattern called [[English:Peristalsis|peristalsis]]. Peristalsis pushes food forward even when you are not thinking about it.

A useful model is a soft ball moving through a flexible tube as the tube is squeezed behind it. The real esophagus uses coordinated muscle contractions rather than gravity alone.

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== Stomach: Mixing and Chemical Digestion ==

The [[English:Stomach|stomach]] is a muscular organ that stores food for a time and mixes it with digestive juices. Its muscles churn the food, adding more mechanical digestion. Stomach acid creates a strongly acidic environment, and enzymes help digest proteins.

[[File:Stomach diagram.svg|400px|frameless|center]]

The stomach does not complete digestion. After mixing, the partly digested material moves a little at a time into the small intestine. This is important because the small intestine is the main place where digestion is completed and nutrients are absorbed.

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== Small Intestine: Digestion and Absorption ==

The [[English:Small intestine|small intestine]] is a long, folded tube. Here, food mixes with digestive juices from the small intestine and pancreas. Bile made by the liver also helps with the digestion of fats.

Most digested nutrients are absorbed through the wall of the small intestine and enter the blood or lymph. The inside surface has many tiny finger-like folds called [[English:Intestinal villus|villi]]. Villi greatly increase the surface area available for absorption.

[[File:Intestinal villus simplified.svg|400px|frameless|center]]

Imagine trying to soak up water with a flat cloth compared with a thick, fluffy towel. More surface area gives more space for contact. Villi work on the same general idea: their folded surface gives nutrients many places to cross into the body.

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== Large Intestine: Water and Waste ==

Material that has not been absorbed moves into the [[English:Large intestine|large intestine]], also called the colon. The large intestine absorbs water and some salts. The remaining material becomes more solid and forms stool.

[[File:Intestine-diagram.svg|450px|frameless|center]]

Many microorganisms live in the large intestine. Together they are part of the [[English:Gut microbiota|gut microbiota]]. Some of these microbes can break down food parts that human enzymes do not fully digest. The gut microbiota is a complex area of science, and different people have different communities of microbes.

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== Rectum and Anus: The Final Stage ==

The [[English:Rectum|rectum]] stores stool before it leaves the body. The [[English:Anus|anus]] is the opening through which stool passes out. This final removal of waste is not the same as digestion itself, but it is part of the digestive system's overall work.

The complete route can be summarized as: mouth → esophagus → stomach → small intestine → large intestine → rectum → anus.

{{#ev:youtube|https://www.youtube.com/watch?v=Og5xAdC8EUI|500|center}}

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= Helper Organs =

Food does not travel through the liver, gallbladder, or pancreas, but these organs are still important for digestion.

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== Liver ==

The [[English:Liver|liver]] has many jobs in the body. For digestion, one important job is making [[English:Bile|bile]]. Bile helps the body digest fats by breaking large fat droplets into smaller droplets, giving digestive enzymes more surface to work on.

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== Gallbladder ==

The [[English:Gallbladder|gallbladder]] stores and concentrates bile made by the liver. When needed, bile is released into the small intestine.

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== Pancreas ==

The [[English:Pancreas|pancreas]] sends digestive juice into the small intestine. This juice contains enzymes that help break down carbohydrates, proteins, and fats. The pancreas has other important jobs too, including making hormones that help control blood glucose, but this course focuses mainly on its digestive role.

The liver, gallbladder, pancreas, and small intestine show how body systems depend on teamwork: one organ can make a substance, another can store it, and another can use it.

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= Mechanical and Chemical Digestion =

'''Mechanical digestion''' changes the size or shape of food without changing what its molecules are made of. Chewing in the mouth and churning in the stomach are examples.

'''Chemical digestion''' breaks large food molecules into smaller molecules that can be absorbed. Enzymes are proteins that speed up specific chemical reactions. Different enzymes work on different kinds of food molecules.

Three big nutrient groups are especially important in digestion:

# [[English:Carbohydrate|Carbohydrate]]: Many digestible carbohydrates are broken down into simple sugars that can be absorbed and used by cells for energy.
# [[English:Protein|Protein]]: Proteins are broken down into amino acids, which the body can use to build and repair tissues and make many important molecules.
# [[English:Fat|Fat]]: Fats are broken into smaller components that can be absorbed and used for energy, cell structures, and other body functions.

Digestion is a sequence, not one single event. Mechanical digestion makes food easier to mix, chemical digestion changes molecules, and absorption moves the useful products into the body.

{{#ev:youtube|https://www.youtube.com/watch?v=kFx9a3TSvXg|500|center}}

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= Nutrients: What Your Body Gets from Food =

A [[English:Nutrient|nutrient]] is a substance the body needs for normal growth and function. Food contains different combinations of nutrients, so eating a variety of foods helps you receive a broad range of them.

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== Carbohydrates ==

[[English:Carbohydrate|Carbohydrate]]s are an important source of energy. Foods such as bread, rice, oats, potatoes, beans, fruit, and many vegetables contain carbohydrates. Whole-grain foods also often provide useful fiber.

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== Proteins ==

[[English:Protein|Protein]] provides amino acids that the body uses for growth, repair, enzymes, hormones, and many cell structures. Protein foods can come from animals or plants. Examples include beans, lentils, peas, eggs, fish, yogurt, tofu, nuts, seeds, and meat.

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== Fats ==

[[English:Fat|Fat]] is a concentrated source of energy. Fats are also part of cell membranes and help the body absorb some vitamins. Sources include oils, nuts, seeds, avocado, fish, dairy foods, and other foods. Different fats have different chemical structures, so nutrition guidance usually encourages a varied diet rather than treating all fats as identical.

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== Vitamins and Minerals ==

[[English:Vitamin|Vitamin]]s and [[English:Mineral|mineral]]s do not provide energy in the same way carbohydrates, proteins, and fats do. Instead, they help control many body processes. For example, calcium supports bones and teeth, iron helps red blood cells carry oxygen, and vitamin C supports the formation of important body tissues.

No single food contains every vitamin and mineral in the amounts every person needs. Variety matters.

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== Water ==

[[English:Water|Water]] is essential for life. It helps transport substances, supports chemical reactions, and helps regulate body temperature. Water is also part of saliva and digestive juices.

How much fluid a person needs can change with age, activity, climate, food choices, health, and other factors. Water and other suitable drinks, as well as water-rich foods, can contribute to fluid intake.

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== Fiber ==

[[English:Dietary fiber|Dietary fiber]] is found mainly in plant foods such as whole grains, beans, lentils, vegetables, fruits, nuts, and seeds. Human digestive enzymes do not fully break down many kinds of fiber. Fiber helps add bulk to stool, and some types are used by microbes in the large intestine.

Fiber is a good example of why "not digested" does not mean "not useful."

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= Balanced Nutrition =

A healthy eating pattern is not about one perfect food. It is about balance, variety, enough food, and choices that fit a person's needs, culture, allergies, health, and access to food.

A useful approach is to include different kinds of foods across the day, such as vegetables, fruits, grain foods, protein-rich foods, and calcium-rich foods or suitable alternatives. Whole grains, beans, fruits, and vegetables can contribute fiber. Water is an important drink choice. Foods that are high in added sugars, salt, or saturated fat can be enjoyed in sensible amounts within an overall varied pattern.

[[File:MyPlate icon.svg|450px|frameless|center]]

The image above is the U.S. MyPlate model, one example of a food-group guide. It is not the only way to build a balanced meal, and food guides differ between countries. The important learning idea is to include variety and several food groups instead of expecting one food to provide everything.

[[File:Dinner meal MyPlate 20210810-FNS-UNC-0016.jpg|500px|frameless|center]]

The meal photo shows grains, beans, milk, squash, and mango. You could build a balanced meal with very different foods from your own culture and still include similar nutrient roles. A lentil stew with rice and vegetables, for example, can provide carbohydrates, protein, fiber, vitamins, and minerals.

The World Health Organization describes a healthy diet as one that includes a wide variety of nutrient-rich foods such as fruits, vegetables, whole grains, legumes, nuts, seeds, and suitable protein sources. [https://www.who.int/news-room/fact-sheets/detail/healthy-diet WHO: Healthy diet]

{{#ev:youtube|https://www.youtube.com/watch?v=YimuIdEZSNY|500|center}}

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= Reading Food Information Carefully =

Nutrition labels can help you compare packaged foods. Depending on the country, a label may show serving information, energy, protein, carbohydrates, fats, sugars, fiber, salt or sodium, and selected vitamins or minerals.

When comparing two products, check that you are comparing similar amounts. A label may give values per serving, per 100 grams, or both. A larger serving naturally contains more of many nutrients than a smaller serving.

Ingredients are usually listed from the greatest amount to the smallest amount by weight. This can help you understand what a packaged food is mainly made from.

A label is a tool, not a score for whether someone is "good" or "bad" at eating. People have different energy needs, medical needs, cultures, budgets, and available foods.

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= Digestion, Nutrition, and Everyday Health =

Several everyday habits can support digestion and nutrition:

# [[English:Chewing|Chewing]]: Chewing breaks food into smaller pieces and mixes it with saliva.
# [[English:Hydration|Hydration]]: Drinking suitable fluids helps the body maintain its normal water balance.
# [[English:Dietary fiber|Dietary fiber]]: Fiber-rich plant foods can support normal bowel function.
# [[English:Food safety|Food safety]]: Washing hands and handling food safely reduces the chance of harmful germs entering the digestive system.
# [[English:Physical activity|Physical activity]]: Regular activity supports overall health and normal body function.

If you have a food allergy, intolerance, digestive condition, or another medical need, general class advice may not fit you exactly. Follow guidance from a parent or caregiver and a qualified health professional.

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== Food Allergy and Food Intolerance ==

A [[English:Food allergy|food allergy]] involves the immune system reacting to a food protein. Some allergic reactions can be serious and need urgent medical care.

A [[English:Food intolerance|food intolerance]] does not involve the same immune reaction. For example, some people have difficulty digesting lactose, a sugar in milk, because they make less of the enzyme lactase.

Never test a suspected allergy by eating the food. Tell a trusted adult and follow medical guidance.

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== Common Misunderstandings ==

'''Myth: Digestion happens only in the stomach.''' Digestion begins in the mouth and continues mainly through the stomach and small intestine.

'''Myth: The large intestine absorbs most nutrients.''' Most digested nutrients are absorbed in the small intestine. The large intestine is especially important for absorbing water and forming stool.

'''Myth: Vitamins give the body calories.''' Vitamins help body processes, but they do not supply energy in the same way carbohydrates, fats, and proteins do.

'''Myth: One "superfood" can provide everything you need.''' Different foods provide different nutrients, so variety is more useful than depending on one food.

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= Interactive Tasks =

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== Quiz: Test Your Knowledge ==

{{MC}}

'''Where does digestion begin?'''
(Mouth)
(!Stomach)
(!Large intestine)
(!Pancreas)

{{E}}
<br>

{{MC}}

'''What movement pushes food through the esophagus?'''
(Peristalsis)
(!Absorption)
(!Filtration)
(!Evaporation)

{{E}}
<br>

{{MC}}

'''Which organ mixes food with acid and enzymes?'''
(Stomach)
(!Liver)
(!Rectum)
(!Gallbladder)

{{E}}
<br>

{{MC}}

'''Where are most digested nutrients absorbed?'''
(Small intestine)
(!Esophagus)
(!Large intestine)
(!Anus)

{{E}}
<br>

{{MC}}

'''What is one main digestive job of the large intestine?'''
(Absorbing water)
(!Chewing food)
(!Making saliva)
(!Starting swallowing)

{{E}}
<br>

{{MC}}

'''Which organ makes bile?'''
(Liver)
(!Stomach)
(!Esophagus)
(!Rectum)

{{E}}
<br>

{{MC}}

'''Which nutrient is broken down into amino acids?'''
(Protein)
(!Water)
(!Mineral)
(!Vitamin)

{{E}}
<br>

{{MC}}

'''What are villi mainly useful for?'''
(Increasing absorption area)
(!Grinding food)
(!Storing stool)
(!Making teeth)

{{E}}
<br>

{{MC}}

'''Which substance begins breaking down some starch in the mouth?'''
(Amylase)
(!Bile)
(!Calcium)
(!Fiber)

{{E}}
<br>

{{MC}}

'''Which choice best describes balanced nutrition?'''
(Eating a variety of suitable foods)
(!Eating only one food group)
(!Avoiding all fats)
(!Skipping water)

{{E}}
<br>

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== Memory Game ==

<div class="memo-quiz">
{|
|-
| Esophagus || Muscular tube that carries swallowed food toward the stomach
|-
| Peristalsis || Wave-like muscle movement that pushes food forward
|-
| Villi || Tiny folds that increase the absorbing surface of the small intestine
|-
| Bile || Fluid made by the liver that helps with fat digestion
|-
| Pancreas || Organ that sends digestive enzymes into the small intestine
|-
| Fiber || Plant material that is not fully digested by human enzymes
|-
| Nutrient || Substance the body needs for growth and normal function
|-
| Rectum || Final storage area for stool before it leaves the body
|}
{{E}}
<br>

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== Drag and Drop ==

<div class="lueckentext-quiz">

{| class="wikitable"
! Match the correct terms.
! Topic
|-
| '''Mouth'''
| Chewing and saliva begin digestion
|-
| '''Stomach'''
| Muscles churn food with acidic digestive juice
|-
| '''Small intestine'''
| Most nutrient absorption takes place here
|-
| '''Large intestine'''
| Water is absorbed and stool is formed
|-
| '''Liver'''
| Bile is produced here
|}
{{E}}

<br>
...
<br />

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== Crossword Puzzle ==

<div class="kreuzwort-quiz">
{|
|-
| Esophagus || Which muscular tube carries swallowed food to the stomach?
|-
| Stomach || Which organ churns food and mixes it with acid?
|-
| Enzyme || What type of molecule speeds up digestive chemical reactions?
|-
| Nutrient || What do we call a useful substance the body needs from food?
|-
| Villi || What tiny projections increase absorption in the small intestine?
|-
| Fiber || What plant food component is not fully digested by human enzymes?
|}
{{E}}
<br>

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== LearningApps ==

<iframe> https://learningapps.org/index.php?s=Human+Digestion+and+Nutrition </iframe>

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== Cloze Text ==

<quiz display=simple>
{'''Complete the text.'''<br>
|type="{}"}
Digestion begins in the { mouth } when chewing mixes food with saliva. The esophagus moves swallowed food by wave-like muscle contractions called { peristalsis }. In the stomach, food is churned and mixed with acid and digestive { enzymes }. Most chemical digestion and nutrient absorption happen in the { small intestine }. Tiny structures called { villi } increase the surface available for absorption. The large intestine absorbs much of the remaining { water }. The liver makes { bile } to help with fat digestion. Foods provide substances called { nutrients } that support growth and body functions. Eating a wide { variety } of suitable foods helps you obtain different nutrients.
</quiz>

<br>

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= Open-Ended Tasks =

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=== Easy ===
# [[English:Food Journey Cartoon|Food Journey Cartoon]]: Draw a seven-panel cartoon that follows a bite of food from the mouth to the anus, and add one short sentence about what happens at each stop.
# [[English:Digestive Organ Labels|Digestive Organ Labels]]: Make your own simple outline of the digestive system and label the mouth, esophagus, stomach, small intestine, large intestine, rectum, liver, gallbladder, and pancreas.
# [[English:Nutrient Hunt|Nutrient Hunt]]: Choose five foods you know and write which major nutrients or fiber each food can provide by using a reliable food label or nutrition source.
# [[English:Balanced Meal Collage|Balanced Meal Collage]]: Create a paper or digital collage of a varied meal from foods common in your culture, then explain which different nutrient roles are represented.

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=== Standard ===
# [[English:Peristalsis Model|Peristalsis Model]]: Build a safe classroom model using a soft ball and a flexible tube or fabric sleeve to show how squeezing behind the ball can move it forward, then explain how the model is similar to and different from the esophagus.
# [[English:Stomach Mixing Model|Stomach Mixing Model]]: With teacher supervision, place crackers and water in a sealed zipper bag and gently squeeze it to model mechanical mixing, then identify at least two important ways the model differs from a real stomach.
# [[English:Food Label Comparison|Food Label Comparison]]: Compare two packaged foods using the same amount, record information such as fiber, sugars, protein, and salt or sodium, and explain what the label can and cannot tell you about an overall diet.
# [[English:Nutrition Interview|Nutrition Interview]]: Interview a school cafeteria worker, dietitian, cook, or family member about how they plan varied meals, then summarize three practical ideas and one question you still have.

{{BR}}
=== Advanced ===
# [[English:Digestion Explainer Video|Digestion Explainer Video]]: Produce a two- to three-minute video that explains mechanical digestion, chemical digestion, absorption, and waste removal using your own diagrams or models.
# [[English:Meal Design Challenge|Meal Design Challenge]]: Design a one-day sample menu for a fictional student with no medical restrictions, explain how the meals provide variety, and state why a real person's needs might be different.
# [[English:Evidence Check|Evidence Check]]: Find one online claim about digestion or nutrition, compare it with information from two trustworthy health or science sources, and write a short verdict explaining whether the claim is well supported.
# [[English:Community Food Study|Community Food Study]]: Visit a food market, grocery store, school cafeteria, or community garden with an adult or teacher, record examples of foods from several food groups, and create a poster showing how local choices can support varied nutrition.

{{:Open Task - Create a MOOC}}

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= Learning Assessment =

# [[English:Explain the Journey|Explain the Journey]]: Use a diagram to explain how one bite of a sandwich moves through the digestive system and identify where mechanical digestion, chemical digestion, nutrient absorption, and water absorption occur.
# [[English:Compare Two Organs|Compare Two Organs]]: Compare the stomach and small intestine by giving at least two differences in their jobs and one way they work together.
# [[English:Solve a Digestion Problem|Solve a Digestion Problem]]: A student says that the stomach absorbs all nutrients; correct the statement and use evidence from the course to explain where most nutrient absorption happens.
# [[English:Design and Defend a Meal|Design and Defend a Meal]]: Create a varied meal and justify your choices by connecting each food to nutrient roles, fiber, or hydration without calling foods simply good or bad.
# [[English:Model Evaluation|Model Evaluation]]: Evaluate a classroom digestion model by identifying what it represents accurately and at least two ways the real digestive system is more complex.
# [[English:Transfer to Daily Life|Transfer to Daily Life]]: Explain how knowledge of food labels, hydration, fiber, and food safety could help someone make a practical choice in a school-day situation.

<br>
<br>

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= Evidence of Learning =

'''Knowledge:''' You can name the main organs of the digestive tract, describe the roles of the liver, gallbladder, and pancreas, and explain the difference between mechanical digestion, chemical digestion, and absorption.

'''Skills:''' You can read a simple food label, compare information using equal amounts, interpret a digestive-system diagram, build and evaluate a model, and check a nutrition claim against reliable sources.

'''Products:''' Your evidence may include a labeled diagram, meal collage, model explanation, interview summary, food-label comparison, poster, or short video.

'''Reasoning:''' You can explain why the small intestine is well suited for absorption, why a varied diet is useful, and why one simple model cannot show every part of real digestion.

'''Transfer:''' You can use what you learned to make sense of everyday food choices, digestion questions, food labels, and health information while recognizing that individual medical needs may require professional guidance.

<br>
<br>

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= OERs on the Topic =

The following English Wikipedia pages provide open reference material for further learning.

<iframe> https://en.m.wikipedia.org/wiki/Human_digestive_system </iframe>

<br>

<iframe> https://en.m.wikipedia.org/wiki/Human_nutrition </iframe>

<br>

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= Linked Learning Areas =

{| align=center
{{:D-Tab}}
'''[[English:Human Digestion and Nutrition|Human Digestion and Nutrition]]'''
# [[English:Digestive system|Digestive system]]
# [[English:Mouth|Mouth]]
# [[English:Esophagus|Esophagus]]
# [[English:Stomach|Stomach]]
# [[English:Small intestine|Small intestine]]
# [[English:Large intestine|Large intestine]]
# [[English:Liver|Liver]]
# [[English:Pancreas|Pancreas]]
# [[English:Nutrient|Nutrient]]
# [[English:Carbohydrate|Carbohydrate]]
# [[English:Protein|Protein]]
# [[English:Fat|Fat]]
# [[English:Vitamin|Vitamin]]
# [[English:Mineral|Mineral]]
# [[English:Dietary fiber|Dietary fiber]]
# [[English:Food safety|Food safety]]
|}

This topic connects [[English:Biology|Biology]] with [[English:Health education|Health education]], [[English:Nutrition|Nutrition]], [[English:Human body|Human body]], [[English:Chemistry|Chemistry]], [[English:Food science|Food science]], and [[English:Physical education|Physical education]]. It also supports practical skills such as reading information, evaluating evidence, communicating scientific ideas, and making thoughtful everyday choices.

[[Category:English]]
[[Category:Human Digestion and Nutrition]]
[[Category:Biology]]
[[Category:Health education]]
[[Category:Nutrition]]
[[Category:Human biology]]
[[Category:Science]]
[[Category:Grades 5-6]]

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= aiMOOC Projects =
[[Category:English]]
[[Category:Human Digestion and Nutrition]]
[[Category:Biology]]
[[Category:Health education]]
[[Category:Nutrition]]
[[Category:Human biology]]
[[Category:Science]]
[[Category:Grades 5-6]]
[[Category:AI_MOOC]]
[[Category:GPT aiMOOC]]
{{MT}}

English:Human Digestion and Nutrition - Versionsgeschichte

Glanz: aiMOOC über GPT aiMOOC Action erstellt