Digestive System
This lesson covers:
- How the digestive system digests and absorbs food
- The role of each organ
The digestive system has two main roles. Briefly describe each of them.
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When we chew food, our teeth physically break the food down into smaller pieces.
How does this help?
(Select all that apply)
It increases the surface area for enzymes to act on
It make the food easier to swallow
It breaks down starch into maltose
It helps us absorb amino acids
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The salivary glands in our mouth release saliva which lubricates the food and makes it easier to .
It also contains the enzyme , which breaks down starch into .
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What is the official name for the tube that carries food from the mouth to the stomach.
(Not the word 'gullet', the other name which is harder to spell)
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3 roles of the stomach
- The stomach contracts its muscular walls to churn and mix the food.
- It produces pepsin, which is a type of enzyme, and breaks down into acids.
- It produces acid, which a) provides the right for pepsin to function, and b) kills microorganisms.
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2 roles of bile
- Bile is made by the , but it is stored in the ,
- After we have meal, it is released into the intestine where it helps in two ways:
- One is to e lipids, which means separate large droplets of lipid into smaller droplets.
- The other is to n the acid from the stomach, which bile can do because it is alkaline
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What is the function of lacteals in the villi?
To maintain the concentration gradient
To transport fatty acids and glycerol
To provide energy for active transport
To absorb glucose and amino acids
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Which enzymes does the pancreas produce?
Amylase and proteases
Proteases and lipases
Amylase, proteases, and lipases
Amylase and lipases
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Which enzymes does the small intestine produce?
Amylase only
It doesn't produce enzymes
Amylase, proteases, and lipases
Amylase and proteases
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Villi are finger-like protrusions of the small intestine that are responsible for absorbing nutrients into the body.
Give three ways in which villi are adapted for this role.
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What is the main role of the large intestine?
Digest proteins
Digest carbohydrates
Absorb water
Absorb vitamins
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