Question

What type of physiological response typically results from positive feedback loop mechanisms?

Answer 1

A growth, increase or continuation of the physiological response. This can also be an enabler of addictions.

Explanation:

A positive feedback is one in which the system responds to a change in the same direction, or one resulting in an increase of the output.

One common example of a positive feedback system in living things is blood clotting. When the skin is cut and a blood vessel experiences damage, platelets in the blood stream collect at the site of the cut and begin releasing several different chemicals that signal more platelet recruitment.

More platelets trigger more chemical releases, which trigger more platelets which then continue this cycle until the platelets and associated proteins have plugged up the cut with a clot.
http://study.com/academy/lesson/positive-negative-feedback-in-biological-systems.html

Another example of biological positive feedback is at the onset of contractions in childbirth. When contraction occurs, oxytocin is released into the body stimulating more contractions. Thus, the result is an increased amplitude and frequency of contractions.
http://www.biology-online.org/dictionary/Positive_feedback