The following is a question from 2013's Medicine entrance exam (Belgium), Biology.
We look at the effect of antidiuretic hormone (ADH) on the concentration of uric acid of blood and on the osmolarity in blood. Furthermore, we look at whether an increased intake of salt has a similar or opposite effect.
Which of these rows is correct?
A: ADH increases: concentration of uric acid
increases/ ADH increases: osmolarity
increases/ Effect of increasing salt intake is:
oppositeB: ADH increases: concentration of uric acid
increases/ ADH increases: osmolarity
decreases/ Effect of increasing salt intake is:
similarC: ADH increases: concentration of uric acid
decreases/ ADH increases: osmolarity
increases/ Effect of increasing salt intake is:
similarD: ADH increases: concentration of uric acid
decreases/ ADH increases: osmolarity
decreases/ Effect of increasing salt intake is:
oppositeMy attempt:
Code
An increase of ADH promotes the absorption of water back into the blood stream. This will lower the osmolarity of blood.
To maintain homeostasis, the uric acid concentration in blood increases. The only viable answer that remains under these two conditions is B
I know that B is correct (according to the exam), however, I can't explain to myself why an increased intake of salt would have a similar effect. I think that an increased intake of salt will result in an increase of osmolarity. The uric concentration will (at first) decrease and ADH will increase to go back to homeostasis. Only after this process will the increased ADH lead to a decreased osmolarity, but the initial effect of increased salt intake should be opposite to that of an increased ADH level?
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