absorption in the small intestine Flashcards
1
Q
what is the small intestine length
benefit
A
5m providing a very large surface area for absorption of products
2
Q
what is the s.i’s interior covered in
b-
A
covered in millions of villi which increases massively the surface area for absorption
3
Q
what is on the surface of villi
b-
A
microvilli further increasing the surface area
4
Q
what is a good supply the villi have
A
the villi have a very good blood supply
this means the bloodstream rapidly removes products and increases the concentration gradient
5
Q
what is the villi membrane like
b-
A
thin membrane
short diffusion path
6
Q
what happens to molecules that cant be absorbed by diffusion
A
they’re absorbed by active transport
