Target cells make more receptors for a particular hormone when the level of that hormone declines in the blood stream.This process is known as:
A)upregulation.
B)downregulation.
C)synergism.
D)the second-messenger system.

Question

Quizplus · Accepted Answer

Upregulation is a process in which the target cells increase the number of receptors for a particular hormone when the hormone level decreases in the blood. This is done to increase the sensitivity of the target cells to the hormone and to maintain the hormonal balance in the body. Downregulation, on the other hand, is a process in which the number of receptors for a particular hormone decreases when the hormone level is high in the blood.

Target Cells Make More Receptors for a Particular Hormone When