Which of the following physiological processes would be considered a positive feedback mechanism?
A) The release of antidiuretic hormone (ADH) from the posterior pituitary gland
B) Shivering in response to low environmental temperature
C) The platelet aggregation mechanism for closing minute ruptures in very small blood vessels during accidental injury
D) Increased production of white blood cells (WBCs) in response to a microorganism
Ans:
C
Feedback:
The release of hormones during labor increases rather than mitigates a physiological system. Specifically, uterine contraction stimulates the production of other relevant hormones that cause temporary instability that culminates in childbirth. ADH counters the potential instability of insufficient hydration and/or blood pressure, much as shivering is an attempt to counter low temperature. Increased production of WBCs is a response to the potential homeostatic instability of an infectious process.
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