Which of the following is an example of positive feedback control of the Endocrine System?
During labor, pressure of baby's head on cervix stimulates release of oxytocin
Menstrual cycle
Blood glucose regulation
Wake/sleep cycle
The Correct Answer is A
A. During labor, pressure of baby's head on cervix stimulates release of oxytocin:
This is a classic example of positive feedback-oxytocin increases uterine contractions, which increase pressure and stimulate more oxytocin release.
B. Menstrual cycle:
The menstrual cycle involves both positive and negative feedback mechanisms, but is not a pure example of positive feedback.
C. Blood glucose regulation:
This is an example of negative feedback involving insulin and glucagon.
D. Wake/sleep cycle:
This is regulated by circadian rhythms, not primarily a feedback loop of endocrine hormones.
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Related Questions
Correct Answer is C
Explanation
A. Diaphoresis:
Excessive sweating is more common in hyperthyroidism due to increased metabolism.
B. Protruding eyeballs:
Exophthalmos is associated with Graves' disease (hyperthyroidism), not hypothyroidism.
C. Weight gain:
Hypothyroidism slows metabolism, often resulting in weight gain.
D. Palpitations:
Palpitations are more common in hyperthyroidism due to increased sympathetic activity.
Correct Answer is B
Explanation
A. Prevents erection: Erection is regulated by blood flow and nerves, not the vas deferens.
B. Induces sterility: Vasectomy (cutting the vas deferens) prevents sperm from being ejaculated, resulting in sterility.
C. Interferes with testosterone secretion: Testosterone is produced by the testes, unaffected by vasectomy.
D. Prevents orgasm: Vasectomy does not affect the ability to have orgasms.
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