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. Progesterone: Related to reproductive cycle; not primary in stress response.
B. Testosterone: May decrease under stress, but this is not the primary indicator.
C. Cortisol: Cortisol is a stress hormone secreted by the adrenal cortex; elevated in stress.
D. LH: May fluctuate with stress, but not a main stress indicator.
Correct Answer is D
Explanation
A. TSH: Stimulates the thyroid gland; not involved in pigmentation.
B. Melatonin: Regulates sleep-wake cycles; not directly responsible for pigmentation.
C. FSH: Stimulates gonads for reproduction; unrelated to skin color.
D. MSH: Stimulates melanocytes to produce melanin, which increases skin pigmentation with sunlight exposure.
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