Which type of muscle is found only in the heart?

Which blood vessel brings blood away from the heart?

Which type of blood vessel brings blood to the heart?

Which structure prevent blood from flowing backward?

In which vessels are materials exchanged between the blood and body cells?

What blood vessel is the smallest vessel- only 1-cell thick to allow easy diffusion of oxygen and nutrients in and out?

Needed substances are carried to the body cells by

Which chamber of the heart pumps oxygen-poor blood to the lungs?

When ventricles contract, blood is pumped

During gas exchange, which substance moves from the alveoli into the blood?

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