Final answer:
Epinephrine and norepinephrine aid in heat production by increasing blood glucose levels and oxygen availability. They stimulate the breakdown of glycogen, increase heart rate, and prioritize blood flow to essential organs.
Step-by-step explanation:
Epinephrine and norepinephrine, collectively known as catecholamines, aid in heat production by increasing blood glucose levels and oxygen availability to cells. They stimulate the liver and skeletal muscles to break down glycogen, releasing glucose which can be used as an energy source. Additionally, these hormones increase the heart rate and dilate the bronchioles, increasing oxygen supply to cells. They also prioritize blood flow to essential organs like the heart, brain, and skeletal muscles, while restricting blood flow to non-essential organs.