15 POINTS ANSWER FAST
Your heart is one big muscle. When the muscle, blood flows into the heart from the rest of the body.

pumps, contracts, or beats. im not sure bc we cant see any multiple choice questions

Explanation:

The heart beats (expands and contracts) about 100,000 times per day, pumping five or six quarts of blood each minute, or about 2,000 gallons per day.

answer: proteins

explanation: complement is   system of circulate in the blood in a inactive form

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