Multiple ChoiceMore than one choice may apply.In the hormone-signaling pathway represented in the figure,_________ is the first messenger, and _______is the second messenger that will signal a change in cell activitya. b. c. d.

Which of the following is NOT a purely endocrine organ?

Which of the following is NOT a major endocrine organ but produces hormones in addition to its major excretory function?

Adrenocorticotropic hormone (ACTH) stimulates the release of (a) thyroid hormones by the hypothalamus, (b) gonadotropins by the adrenal glands, (c) growth hormones by the hypothalamus, (d) steroid hormones by the adrenal glands.

A cell's hormonal sensitivities are determined by the (a) chemical nature of the hormone, (b) quantity of circulating hormone, (c) shape of the hormone molecules, (d) presence or absence of appropriate receptors, (e) thickness of its plasma membrane.

Explain what mechanism of hormone action is occurring in this image. How does it work? Give an example of a hormone that uses this mechanism.

What six hormones primarily affect growth?

Describe the chemical nature of hormones.

Define hormone.