Circulatory System

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

Which type of muscle is found only in the heart?

Which type of blood vessel brings blood to the heart?

Which blood vessel brings blood away from the heart?

When ventricles contract, blood is pumped

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

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

Which structure prevent blood from flowing backward?