What is the largest artery in the body?

What do you call the flap of tissue that prevents blood from flowing backwards?

Name the blood vessel that takes blood away from the heart.

What are the two upper chambers of the heart?

What blood vessel carries blood back to the heart?

What do you call a group of heart cells that send out signals that make the heart muscle contract?

What are the two lower chambers of the heart called?

Name the tiny blood vessel where substances are exchanged between the blood and body cells.

What do you call the hollow muscular organ that pumps blood throughout the body?

Name the system that consist of the heart, blood vessels, and blood.

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