The primary source of heat production during exercise is
A)the heart.
B)the gastrointestinal tract.
C)through the action of thyroxine and catecholamines.
D)the contracting skeletal muscles.

Question

Quizplus · Accepted Answer

The primary source of heat production during exercise is the contracting skeletal muscles. During exercise, muscles contract and produce energy in the form of ATP. This process generates heat, which is then transferred to the body's tissues and organs. Other factors such as thyroxine and catecholamines also play a role in heat production, but the primary source is the contracting muscles. The heart and gastrointestinal tract do not produce significant amounts of heat during exercise.

The Primary Source of Heat Production During Exercise Is