Small Intestine

Question 1

Length of small intestine

Answer 1

Very long, around 5m
= very large surface area for absorption of products of digestion

Question 2

Describe interior of small intestine

Answer 2

Covered with millions of villi
= increase surface area for absorption of molecules

Question 3

Adv of villi

Answer 3

Very good blood supply
= bloodstream rapidly removes products of digestion
= increases concentration gradient

Question 4

Adv of villi membrane

Answer 4

Thin membrane
= short diffusion path
= rapid rate of diffusion

Question 5

Adaption of small intestine

Answer 5

Contain mitochondria
= for aerobic respiration for active transport
Covered in villa
= large surface area
Villi thin walls
= shorter diffusion distance