Which condition causes plaque to accumulate on the walls of the arteries, which make them sick and lose elasticity

Atherosclerosis, sometimes called "hardening of the arteries," occurs when fat, cholesterol, and other substances build up in the walls of arteries. These deposits are called plaques. Over time, these plaques can narrow or completely block the arteries and cause problems through ought the body  

Explanation:

for question 8

1: it gets the blood pumping more

2: endorphins and other neurotransmitters