Absorption in the Small Intestine

Question 1

Explain the final products of the three main components of food

Answer 1

carbohydrates> sugar (mono)
proteins > amino acids
lipids > fatty acids + glycerol

Question 2

What happens to the nutrients once they are in their final brake down

Answer 2

absorbed through ilium , intestinal wall, into blood or lymph

Question 3

Does the absorption occur with active or passive transport

Answer 3

both

Question 4

How is the small intestine suited for its function of absorption (5)

Answer 4

1) contin. flow of blood and food= concentration main.
2) capillaries close to surface= easy diffusion
3) lacteals present= diffusion of large molec.
4) villi + micro villi= SA
5) length of intestine + villi = slow progression of food

Question 5

What substances are absorbed into the bloodstream

Answer 5

sugars and amino acids vitamins and minerals

Question 6

What substances are absorbed into the lacteals

Answer 6

fatty acids and glycerol, larger molecules

Question 7

What happens once absorbed into blood vessels

Answer 7

1) carried to liver via hepatic portal vein
2) the liver - converts glocose to glycogen, amino acids to proteins, stores vitamins
3) whats left = assimunation

Question 8

Define assimunation

Answer 8

movement of digested materials into cells

Question 9

What happens once absorbed into lacteals

Answer 9

1) transported to lymph system

2) eventually emptied into blood

Question 10

What can the body not breakdown

Answer 10

fibre

Question 11

What substances don’t need to be broken down and why

Answer 11

vitamins, minerals, water, already small enough