Human Nutrition (Villi) Flashcards Preview

Biology: The Heart + Human Nutrition + Cell Structure > Human Nutrition (Villi) > Flashcards

Flashcards in Human Nutrition (Villi) Deck (15)
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1
Q

What are contained in the lining of the duodenum and ileum?

A

Villi

2
Q

How is food absorbed by villi?

A

By diffusion

3
Q

What are the adaptations of the villi for absorption?

4

A

Large numbers
Large numbers of microvilli
Their walls are only one cell thick
They have a rich blood supply

4
Q

As villi are numerous and their microvilli are also numerous, how does this aid absorption?

A

As they increase the surface area

5
Q

What do the capillaries in each villus absorb?

A

Water and soluble nutrients

6
Q

What soluble nutrients are absorbed by the capillaries?

4

A

Glucose
Amino acids
Vitamins
Minerals

7
Q

Where do the capillaries in the villi carry nutrients to?

A

The hepatic vein

8
Q

Where are the soluble nutrients taken by the hepatic vein?

A

To the liver

9
Q

What does the liver do to nutrients?

A

It stores some and releases others for use throughout the body

10
Q

What cannot be stores in the liver?

A

Excess amino acids

11
Q

Why can excess amino acids not be stored by the liver?

A

As they become toxic

12
Q

What is deamination?

A

The breaking down of excess amino acids by the liver to form urea

13
Q

What is the breaking down of excess amino acids by the liver to form urea called?

A

Deamination

14
Q

How does urea and other waste leave the liver?

A

Through the hepatic vein and eventually pass through the kidneys

15
Q

What does urea form in the kidneys?

A

It becomes a part of urine which is then excreted

Decks in Biology: The Heart + Human Nutrition + Cell Structure Class (42):