Which body function is controlled through a positive feedback mechanism?
Correct answer: A. Labor contractions
- A. Labor contractions
- B. Body temperature
- C. Insulin production
- D. Thyroxine release
Explanation
A feedback mechanism is a loop system wherein the system responds to a perturbation. The response may be in the same direction (as in positive feedback) or in the opposite direction (as in negative feedback). An example of positive feedback is uterine contractions during childbirth. The hormone oxytocin, made by the endocrine system, stimulates the contraction of the uterus. This produces the pain sensed by the nervous system. In response, more oxytocin is released, which in turn stimulates the contractions even more. This loop of the 'pain induced from contractions stimulating the release of oxytocin, and oxytocin stimulating more contraction continues with increasing intensity' still the fetus is born. This is a positive feedback loop; hence, Option A is correct.
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About Coordination and Control
Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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