Why does your heart never tire of constantly beating to pump blood throughout your body?

Which management function requires assigning tasks?

What does the body do during the resistance phase of the gas model? options: a) it prepares to fight danger or run from it. b) it identifies the primary source of danger. c) it begins to return responses to normal. d) it repairs itself from fatigue and stress.

What system have glands found throughout the body that release hormones into the bloodstream