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Which one of the following statements is correct with respect to kidney function regulation?
A
During summer when body loses lot of water by evaporation, the release of ADH is suppressed
B
When someone drinks lot of water, ADH release is suppressed
C
Exposure to cold temperature stimulates ADH release
D
An increase in glomerular blood flow stimulates formation of Angiotensin II
Detailed Solution
Osmoreceptors in the body respond to changes in blood volume, body fluid volume and ionic concentration.
When a person drinks a lot of water, the body fluid volume increases and its osmolarity falls; this switches off the osmoreceptors and suppresses ADH release. Less water is reabsorbed and dilute urine is passed. This statement is correct.
In summer, heavy loss of water by evaporation activates the osmoreceptors and stimulates (not suppresses) ADH release, so that water is conserved.
Exposure to cold reduces sweating and decreases ADH release, which is why more urine is passed in cold weather.
Angiotensin II is formed when the JG cells release renin in response to a fall (not an increase) in glomerular blood flow or pressure.
Hence the correct statement is that ADH release is suppressed when someone drinks a lot of water.
When a person drinks a lot of water, the body fluid volume increases and its osmolarity falls; this switches off the osmoreceptors and suppresses ADH release. Less water is reabsorbed and dilute urine is passed. This statement is correct.
In summer, heavy loss of water by evaporation activates the osmoreceptors and stimulates (not suppresses) ADH release, so that water is conserved.
Exposure to cold reduces sweating and decreases ADH release, which is why more urine is passed in cold weather.
Angiotensin II is formed when the JG cells release renin in response to a fall (not an increase) in glomerular blood flow or pressure.
Hence the correct statement is that ADH release is suppressed when someone drinks a lot of water.