Year 8 Biology - Cool Food Digestion and Enzyme Fun! 📚

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Eliza Haigh

16/03/2023

Biology

Biology food and digestion

Subjects

Biology

Organisation

Animal organisation - digestion

Digestive enzymes

Year 8 Biology - Cool Food Digestion and Enzyme Fun! 📚

The digestive system is a complex network of organs that break down food into nutrients the body can use. This process involves mechanical and chemical digestion, with enzymes playing a crucial role in breaking down different types of nutrients.

Digestive system function includes breaking down food, absorbing nutrients, and eliminating waste
Key organs involved are the mouth, esophagus, stomach, small intestine, large intestine, liver, and pancreas
Enzymes role digestive system year 8 pdf highlights the importance of specific enzymes in breaking down carbohydrates, proteins, and lipids
Food tests Biology are used to identify the presence of different nutrients in food samples

16/03/2023

Food tests:
Starch: lodine.
caour change is
Starch is present
glycerol red/brown 4> black-
$3 fatty acids
lipids
lipids are made of
Smaller

The Digestive System and Healthy Lifestyle

This page focuses on the structure and function of the digestive system, as well as touching on aspects of a healthy lifestyle.

The Digestive system BBC Bitesize KS3 content is reflected in the description of the digestive system's components:

Mouth: Food is chewed and mixed with saliva
Stomach: Churns and mixes food with hydrochloric acid
Liver: Produces bile to help break down fat droplets
Pancreas: Produces digestive juices containing enzymes
Small intestine: Completes digestion and absorbs nutrients into the bloodstream
Large intestine: Absorbs water into the bloodstream
Rectum: Stores feces until it leaves through the anus

Example: The liver produces bile, which helps break down food fat droplets into smaller, more manageable pieces.

The page also introduces the concept of malnutrition, which occurs when people don't eat the right amounts of nutrients. This can lead to deficiencies or obesity.

Definition: A drug is a substance that has an effect on the body. Drugs can be medicinal $to help people suffering from pain or disease$ or recreational $taken for their effects$ .

The page distinguishes between legal drugs $like alcohol and nicotine$ and illegal drugs $such as cocaine and heroin$ .

View

Organ Adaptations and Enzymes

This page delves deeper into how specific organs are adapted for their functions in the digestive system and introduces the crucial role of enzymes.

Highlight: Enzymes speed up the breakdown of food without being used up themselves. They are biological catalysts.

The stomach is adapted with muscle tissue in its wall that contracts to churn food, breaking it down mechanically. Hydrochloric acid in the stomach kills microorganisms.

The large intestine is responsible for removing excess water from the waste left over from the digestive process.

Vocabulary: Mechanical digestion refers to the physical breakdown of food, such as chewing in the mouth.

The page introduces three main types of digestive enzymes:

Protease: Breaks down proteins
Carbohydrase: Breaks down carbohydrates $amylase is a specific carbohydrase that breaks down starch into glucose$
Lipase: Breaks down lipids

Example: Amylase enzyme is produced in the salivary glands, the small intestine and which other organ? The pancreas also produces amylase.

View

Specific Organs of the Digestive System

The final page provides detailed information about specific organs in the digestive system, expanding on their structures and functions.

The small intestine is described as a 6-meter long muscular tube where food from the stomach is mixed with enzymes for further digestion.

Definition: The rectum is a 10cm long chamber where food leaves the body. When its contents are ready to be released, the muscles around the anus relax and the muscles in the rectum contract.

The esophagus is explained as a muscular tube that moves food from the mouth to the stomach through muscular contractions.

The pancreas is highlighted for its role in producing enzymes that break down proteins, fats, and carbohydrates.

Highlight: The liver produces bile, which is stored in the gallbladder. Bile neutralizes stomach acid, providing alkaline conditions needed for enzymes to work effectively in the small intestine.

This page reinforces the interconnected nature of the digestive system, showing how each organ plays a specific role in the process of breaking down food and absorbing nutrients.

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Subjects

Biology

Organisation

Animal organisation - digestion

Digestive enzymes

Biology

•

347

•

16 Mar 2023

•

4 pages

Year 8 Biology - Cool Food Digestion and Enzyme Fun! 📚

Eliza Haigh

@elizahaigh_ngxf

Digestive... Show more

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The Digestive System and Healthy Lifestyle

This page focuses on the structure and function of the digestive system, as well as touching on aspects of a healthy lifestyle.

The Digestive system BBC Bitesize KS3 content is reflected in the description of the digestive system's components:

Mouth: Food is chewed and mixed with saliva

Stomach: Churns and mixes food with hydrochloric acid

Liver: Produces bile to help break down fat droplets

Pancreas: Produces digestive juices containing enzymes

Small intestine: Completes digestion and absorbs nutrients into the bloodstream

Large intestine: Absorbs water into the bloodstream

Rectum: Stores feces until it leaves through the anus

Example: The liver produces bile, which helps break down food fat droplets into smaller, more manageable pieces.

The page also introduces the concept of malnutrition, which occurs when people don't eat the right amounts of nutrients. This can lead to deficiencies or obesity.

Definition: A drug is a substance that has an effect on the body. Drugs can be medicinal $to help people suffering from pain or disease$ or recreational $taken for their effects$ .

The page distinguishes between legal drugs $like alcohol and nicotine$ and illegal drugs $such as cocaine and heroin$ .

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Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Organ Adaptations and Enzymes

This page delves deeper into how specific organs are adapted for their functions in the digestive system and introduces the crucial role of enzymes.

Highlight: Enzymes speed up the breakdown of food without being used up themselves. They are biological catalysts.

The stomach is adapted with muscle tissue in its wall that contracts to churn food, breaking it down mechanically. Hydrochloric acid in the stomach kills microorganisms.

The large intestine is responsible for removing excess water from the waste left over from the digestive process.

Vocabulary: Mechanical digestion refers to the physical breakdown of food, such as chewing in the mouth.

The page introduces three main types of digestive enzymes:

Protease: Breaks down proteins

Carbohydrase: Breaks down carbohydrates $amylase is a specific carbohydrase that breaks down starch into glucose$

Lipase: Breaks down lipids

Example: Amylase enzyme is produced in the salivary glands, the small intestine and which other organ? The pancreas also produces amylase.

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Specific Organs of the Digestive System

The final page provides detailed information about specific organs in the digestive system, expanding on their structures and functions.

The small intestine is described as a 6-meter long muscular tube where food from the stomach is mixed with enzymes for further digestion.

Definition: The rectum is a 10cm long chamber where food leaves the body. When its contents are ready to be released, the muscles around the anus relax and the muscles in the rectum contract.

The esophagus is explained as a muscular tube that moves food from the mouth to the stomach through muscular contractions.

The pancreas is highlighted for its role in producing enzymes that break down proteins, fats, and carbohydrates.

Highlight: The liver produces bile, which is stored in the gallbladder. Bile neutralizes stomach acid, providing alkaline conditions needed for enzymes to work effectively in the small intestine.

This page reinforces the interconnected nature of the digestive system, showing how each organ plays a specific role in the process of breaking down food and absorbing nutrients.

Sign up to see the contentIt's free!

Access to all documents

Improve your grades

Join milions of students

By signing up you accept Terms of Service and Privacy Policy

Food Tests and Nutrients

The first page of the Year 8 biology food digestion notes pdf introduces various food tests and explains the importance of different nutrients.

Definition: Food tests are chemical procedures used to identify the presence of specific nutrients in food samples.

The page outlines several important food tests:

Food test for starch: Uses iodine, which turns black-blue if starch is present.

Food test for lipids: Uses ethanol, which forms a cloudy emulsion with lipids.

Food test for protein: Uses the Biuret test, which turns violet in the presence of proteins.

Food test for glucose: Uses Benedict's solution, which turns from blue to brick-red if glucose is present.

Vocabulary: Lipids are made of smaller molecules called glycerol and three fatty acids.

The page also explains the importance of various nutrients:

Carbohydrates and lipids provide energy

Proteins are used for growth and repair

Fiber provides bulk to keep food moving through the gut

Water is needed in all cells and body fluids

Highlight: Carbohydrates, like starch, are made of small molecules called sugars, such as glucose.

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Year 8 Biology - Cool Food Digestion and Enzyme Fun! 📚

The Digestive System and Healthy Lifestyle

Organ Adaptations and Enzymes

Specific Organs of the Digestive System

Similar content

Can't find what you're looking for? Explore other subjects.

Knowunity is the #1 education app in five European countries

Knowunity has been named a featured story on Apple and has regularly topped the app store charts in the education category in Germany, Italy, Poland, Switzerland, and the United Kingdom. Join Knowunity today and help millions of students around the world.

4.9+

21 M

#1

950 K+

Still not convinced? See what other students are saying...

I love this app so much, I also use it daily. I recommend Knowunity to everyone!!! I went from a D to an A with it :D

The app is very simple and well designed. So far I have always found everything I was looking for :D

I love this app ❤️ I actually use it every time I study.

Year 8 Biology - Cool Food Digestion and Enzyme Fun! 📚

Sign up to see the contentIt's free!

The Digestive System and Healthy Lifestyle

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Organ Adaptations and Enzymes

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Specific Organs of the Digestive System

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Food Tests and Nutrients

Similar content

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