Melatonin's actions may include
A) regulation of circadian rhythms
B) antioxidant activity
C) induction of calcium reabsorption
D) both a and b
E) none of the above
Correct Answer:
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Q36: _ do(es) not use a second messenger
Q37: The effective plasma concentration of a hormone
Q38: A hormone's effective plasma concentration can be
Q39: Which hormones use second-messenger systems?
A)proteins
B)catecholamines
C)steroids
D)thyroid hormone
E)Both c
Q40: In one kind of second-messenger system,
A)a small
Q42: Which structure(s) is/are neuroendocrine in nature?
A)anterior pituitary
B)posterior
Q43: The posterior pituitary
A)is composed of nervous tissue
B)stores
Q44: Select the incorrect association.
A)adrenal medulla/vasopressin
B)anterior pituitary/adenohypophysis
C)epinephrine/catecholamine
D)insulin/polypeptide
E)posterior pituitary/neurohypophysis
Q45: Melatonin is an antioxidant that
A)accelerates metabolism
B)defends against
Q46: Which of the following hormones secreted by
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