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 B
Explanation
A. Ovulation: Ovulation is the release of an egg from the ovary.
B. Ectopic pregnancy: Implantation of a fertilized egg outside the uterus, commonly in the fallopian tube.
C. Menarche: Menarche is the first menstrual period.
D. Menses: Menses is the shedding of the uterine lining during menstruation.
Correct Answer is D
Explanation
A. Over secretion of aldosterone: Aldosterone promotes water reabsorption, which reduces urine output.
B. Decreased GFR (glomerular filtration rate): This would lead to less urine formation, not polyuria.
C. Activation of angiotensinogen: This ultimately leads to water retention, not increased urination.
D. Deficiency of ADH: ADH (antidiuretic hormone) promotes water reabsorption. Its deficiency (as in diabetes insipidus) leads to excessive urine output.
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