Question
Tropic hormones require ____ to act.
Answer
Tropic hormones require an intermediary to act.
Note: For example, gonadotropin-releasing hormone (GnRH) from the hypothalamus stimulates the release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). LH then acts on the gonads to stimulate testosterone production in the male and estrogen production in the female. GnRH and LH do not cause direct changes in the physiology of muscle, bone, and hair follicles; rather, they stimulate the production of another hormone by another endocrine gland that acts on these target tissues.
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Endocrine signaling involves the secretion of hormones ____
Endocrine signaling involves the secretion of ____ directly into the bloodstream.
Hormones bind to target receptors and ____
____ hormones are composed of amino acids.
Peptide hormones are composed of ____.
____ are signaling molecules that are secreted directly into the bloodstream to distant target tissues.