sodium co transport

Question 1

villi

Answer 1

folding of a tissue (eg intestine)

Question 2

microvilli

Answer 2

folding of a cell (eg epithelial cells)

Question 3

ileum characteristics

Answer 3

many villi and microvilli = high SA
rich blood supply
many lymphatic vessels
short diffusion pathway

Question 4

sodium co-transport step 1

Answer 4

sodium ions exit cell (into the blood) through Na/K pump - reduces sodium concentration in cell

Question 5

sodium co-transport step 2

Answer 5

sodium ions enter the cell via facilitated diffusion from the ileum - the ions carry glucose with them into the cell

Question 6

sodium co-transport step 3

Answer 6

glucose ions diffuse into the blood

Question 7

sodium co-transport characteristics

Answer 7

very little ATP used

occurs after dynamic equilibrium is reached through diffusion