Vasopressin is a hormone that is primarily released when the body is low on water. Release of vasopressin causes the kidneys to conserve water by concentrating urine and decreasing urine output. However, vasopressin also has additional functions in other tissues such as the brain and blood vessels, which are not directly involved in urine production. How could it be possible for vasopressin to trigger different responses in different tissues?
A. Vasopressin binds to the same exact receptor in different tissues, but causes a different conformational change to the receptor in each tissue.
B. The kidneys have a receptor for vasopressin, but cells in the brain and blood vessels do not have a receptor for vasopressin.
C. Vasopressin can bind to, and act on, different receptor subtypes, leading to different cellular responses in different tissues.
D. Vasopressin can be released at different times to result in different effects.
Answer: C
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