It is essential for: Humans can not survive without circulatory system which includes heart and blood vessels. This system provides oxygen carrying blood to all parts of the body. The heart pumps blood and the arteries carry it around and the veins return it back to heart(and lungs for oxygenation).
Answered 4/11/2016
4.9k views
A doctor has provided 1 answer
A doctor has provided 1 answer
A doctor has provided 1 answer
90,000 U.S. doctors in 147 specialties are here to answer your questions or offer you advice, prescriptions, and more.
Ask your question