Answer:
It is impossible for a person to hold their breath long enough to pass out because our body has the ability to control the breathing mechanism itself without influence from outside causes.
Explanation:
The heart is a muscular organ in most animals, which pumps blood through the blood vessels of the circulatory system. The pumped blood carries oxygen and nutrients to the body, while carrying metabolic waste such as carbon dioxide to the lungs.
It should be side chain, by looking at a diagram online, idk if im right, but it looks logical.
I would say..
B.) One-quarter to one-third.
Good Luck! :)
