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. Neurons: Neurons transmit signals in the nervous system, not the endocrine system.
B. Neuroglia: Neuroglia support neurons but do not transmit hormonal signals.
C. Hormones: Hormones are the chemical messengers of the endocrine system, traveling via the bloodstream to target organs.
D. Neurotransmitter: Neurotransmitters are messengers of the nervous system.
Correct Answer is A
Explanation
A. Erythropoietin:
Erythropoietin is released by the kidneys in response to hypoxia to stimulate red blood cell production.
B. Renin:
Renin is secreted in response to low blood pressure, not low oxygen levels.
C. ADH:
ADH responds to high plasma osmolality and low blood volume, not oxygen levels.
D. Aldosterone:
Aldosterone is secreted in response to low sodium or high potassium, and part of the RAAS, not oxygen deficiency.
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