Where does the lungs initially supply the oxygen to? * The muscles
The brain
The heart
The Pancreas

brain

Explanation:

u cant survive without oxygen to the brain first and formost, u can survive a little dead tissue from lack of oxygen to muscles tho. the brain is the thing u need most inorder to function

if you are asking how much they can go over the 1500 limit it would be safetly within the 2310 and 2600.mg

answer; /// i believe its (643,000) every year;