When a hormone is present in excessive levels,the number of target-cell receptors may decrease.This is called
A)receptor recognition.
B)sensory adaptation.
C)paracrine regulation.
D)up-regulation.
E)down-regulation.

Question

Quizplus · Accepted Answer

When there is an excessive amount of a hormone present, the target cells may decrease the number of receptors available in order to prevent overstimulation. This is called down-regulation. It allows for better control of hormone signaling and helps to prevent damage to the target cells.

When a Hormone Is Present in Excessive Levels,the Number of Target-Cell