When a catecholamine or peptide hormone binds to receptors on the surface of a cell, the
A) hormone receptor complex moves into the cytoplasm.
B) cell membrane becomes depolarized.
C) second messenger appears in the cytoplasm.
D) cell becomes inactive.
E) hormone is transported to the nucleus where it alters the activity of DNA.

Question

Quizplus · Accepted Answer

When a catecholamine or peptide hormone binds to receptors on the surface of a cell, it typically activates a secondary messenger system, in which the hormone-receptor complex triggers the production of intracellular signaling molecules. These secondary messengers include cyclic AMP, inositol trisphosphate, and calcium ions, which ultimately lead to changes in cellular activity. Therefore, option C, where a second messenger appears in the cytoplasm, is the best choice.

When a Catecholamine or Peptide Hormone Binds to Receptors on the Surface