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?

Describe the chemical nature of hormones.

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?

Which type of hormone receptor—plasma membrane bound or intracellular—would be expected to provide the most long-lived response to hormone binding and why?