Under which of the following situations would receptor down-regulation most likely occur?
A) The concentration of a neurotransmitter is too low.
B) The concentration of a hormone is too high.
C) The number of receptors in the plasma membrane is too low.
D) The number of G proteins is too high.
E) The cell is unable to manufacture cyclic AMP.

Question

Quizplus · Accepted Answer

Receptor down-regulation typically occurs when there is an excess of a hormone or ligand, leading to a decrease in receptor numbers to reduce sensitivity and prevent overstimulation.

Under Which of the Following Situations Would Receptor Down-Regulation Most