They are part of the human brain.
Answer:
The heart's main job is to pump oxygen-rich blood to the body after it pumps ... Together, the arteries and veins are referred to as the vascular system. ... It plays an important role in helping the body meet the demands of activity, ... of diseases or conditions dealing with the heart and vascular systems.
Explanation:
A chemical that effects the brain is Psychoactive drugs
I would say blood glucose(blood sugar)
Explanation:
I am diabetic, so endocrinology is my thing. the pancreas releases insulin
Running in the morning strengthens your heart, and improves stamina after a while.
Hope this helps! ^~^
