Which statement about hormones, hormone-producing cells, and target cells is true?
A) Target cells have receptors for binding the hormone they are a target for.
B) Endocrine cells do not exist as single cells within a tissue.
C) All hormones travel in the blood to target cells.
D) Endocrine glands have ducts that lead to the outside of the body.
E) Cells in close proximity to hormone-producing cells are more strongly affected by the hormone than cells at a distance.

Question

Quizplus · Accepted Answer

Target cells have specific receptors for the hormone they are meant to bind to, allowing for a specific response to occur. This is the basis for the specificity of hormone action. The other options are incorrect - endocrine cells can exist as single cells or groups within a tissue, not all hormones travel through the blood (some are paracrine or autocrine), endocrine glands do not have ducts leading outside the body (they secrete into the blood), and proximity to hormone-producing cells does not necessarily determine the strength of the response (receptor density and affinity also play a role).

Which Statement About Hormones, Hormone-Producing Cells, and Target Cells Is