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. Responsible for uterine contractions: Oxytocin is responsible for contractions during labor.
B. Secreted by the ovaries: Estrogen and progesterone are the primary female sex hormones secreted by the ovaries.
C. Hormonal stimuli for the release of T3 and T4: Thyroid-stimulating hormone (TSH), not estrogen/progesterone, triggers T3/T4 release.
D. Responsible for milk production: Prolactin is responsible for milk production.
Correct Answer is C
Explanation
A. Ovaries: Site of ovum production, not implantation.
B. Oviducts: Another term for fallopian tubes; fertilization occurs here but not implantation.
C. Uterus: Embryo implants in the endometrial lining of the uterus.
D. Fallopian tubes: Ectopic pregnancies may occur here, but this is abnormal.
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