The answer is c. It is c because after you do strenuous exercise you are in recovery so it is recovery heart rate.
C, because if you are using music to relax, you want music that is peaceful, and that it wont cause singing. The purpose of relaxing is to be in peace and tranquility. dozing off is okay because it signifies that the body is tired and needs to be deeply relaxed.
Negative-feedback: Heart rate goes down
Positive-feedback: Hear rate goes up
Answer:
D
They're caused by repetitive force, such as jumping up and down or running long distances
