Question

High body temperature in mammals reflexively causes a change in blood flow and sweating, which act to reduce the temperature. This is a _____ feedback loop because response to the signal results in a(n) _____ of that signal.
A. negative; increase
B. positive; decrease
C. negative; decrease
D. positive; increase

Answer 1

Answer: Option B) positive; decrease

High body temperature in mammals reflexively causes a change in blood flow and sweating, which act to reduce the temperature. This is a positive feedback loop because response to the signal results in a decrease of that signal.

Explanation:

A positive feedback loop occurs when an organism responds to disturbing changes in its environment by adjusting its internal body processes to cope with the changes should it continue.

Thus, the body switches on vasodilation and sweating through a positive feedback loop to decrease its high temperature caused by the environment