Membrane Receptors are Used by Which of the Following Types

Question

Membrane receptors are used by which of the following types of hormones?
A) catecholamines
B) peptide hormones
C) eicosanoids
D) thyroid
E) catecholamines, peptide hormones, and eicosanoids

Accepted Answer

Membrane receptors are used by catecholamines, peptide hormones, and eicosanoids. These types of hormones cannot penetrate the cell membrane; therefore, they must bind to a receptor on the cell surface to initiate a signal transduction cascade inside the cell. Thyroid hormones, on the other hand, are lipid-soluble and can penetrate the cell membrane to bind to intracellular receptors.