Biology

3 January, 16:44

After a long soccer practice, Jack felt his pulse increase. As he cooled down, his pulse began to slow. Since he'd been studying the circulatory

system in science class, he knew why his pulse slowed.

What is the main structure of the circulatory system that makes the blood move through the body?

O

A. artery

O

•

B. lymph vessels

C. heart

D. lungs

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