Which of the following is true about hormones?

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Question 1 of 5

A. They are released from exocrine glands. B. They interact with receptors at target-cell sites. C. They are synthesized in the lymph nodes. D. They interact with receptors in the blood.

Correct Answer: B

Rationale: Hormones act via receptors on target cells, not in blood or lymph nodes; they vary chemically.

Question 2 of 5

In one kind of second-messenger system,

A. a small amount of one hormone (second messenger) is required to release another B. a tropic hormone (first messenger) stimulates secretion of another hormone (the second messenger) C. the hormone binds to a specific surface receptor, whereupon the hormone-receptor complex moves into the cell to combine with an intracellular receptor D. a hormone (first messenger) binds to surface receptors that activate adenylate cyclase, which then catalyzes cAMP formation

Correct Answer: D

Rationale: This describes the cAMP second-messenger system used by many hydrophilic hormones.

Question 3 of 5

With regards to circadian rhythms,

A. the hypothalamus supraoptic nucleus maintains them B. the suprachiasmatic nucleus is responsible for generating them C. they are brought about by fluctuating levels of clock proteins D. both a and b are true

Correct Answer: D

Rationale: The suprachiasmatic nucleus (SCN) generates circadian rhythms via clock proteins.

Question 4 of 5

Identify the gonadotropic hormone(s).

A. LH B. FSH C. Testosterone D. Only a and b

Correct Answer: D

Rationale: LH and FSH from the anterior pituitary stimulate gonadal function.

Question 5 of 5

Hypophysiotropic hormones

A. control the release of oxytocin and vasopressin from the posterior pituitary B. travel via neuron axons from the hypothalamus to the anterior pituitary C. are carried in the hypothalamo-hypophyseal portal system D. are released upon positive-feedback stimulation via anterior pituitary tropic hormones

Correct Answer: C

Rationale: These hormones travel via the portal system to regulate anterior pituitary secretion.

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Which of the following is true about hormones?

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ATI Medical Surgical Endocrine Quiz Questions

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