Answer: The human circulatory system has a complex network of blood vessels that reach all parts of the body. This extensive network supplies the cells, tissues, and organs with oxygen and nutrients, and removes carbon dioxide and waste compounds.
Explanation:
Your kidney will release adrenaline (epinephrine) when your fight or flight response is activated or when your body is under stress.
Answer:
Rest each muscle group for at least 48 hours to maximise gains in strength and size.
