June 2022 Paper 2

Question 1

Describe the effect of ADH on the collecting ducts in the kidneys

Answer 1

-1. (Stimulates) addition of channel proteins into membrane
-2. More water reabsorbed
-3. By osmosis

Question 2

Give two reasons why transmission across a cholinergic synapse is unidirectional

Answer 2

-only one presynaptic membrane
-impulses only present on postsynaptic membrane