What blood vessel sends blood away from the heart?

What are either of the two upper chambers of the heart?

What are either of the two lower chambers of the heart?

What is a tube in the body in which blood flows?

What are some of the parts of the Circulatory system?

What are tiny blood vessels called?

Which organ supplies blood with oxygen?

The organ that pumps blood throughout the body

Structures that open and close to control blood flow through the heart

a waste product in the blood that comes from the breakdown of proteins