Heart, blood vessels: We use the heart and blood vessels to create blood circulation. In fact, by the second month of pregnancy, a new baby's heart is already beating. The heart pumps blood out via vessels called arteries. The smallest arteries, everywhere in the body, can tighten down or can open wider, thus regulating the amount of blood flow to different parts of the body. Post a new question for more information.
Answered 11/24/2019
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A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
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