Describe the chemical nature of hormones.

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

More 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 activity.

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?

Define hormone.

Provide one example for each way endocrine glands are stimulated to release their hormones.

What four conditions cause the release of erythropoietin?

In what ways can a hormone modify the activities of its target cells?