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• 1. The two atria are thin-walled chambers that receive blood from the veins.

• 2. Ventricle, muscular chamber that pumps blood out of the heart into the circulatory system.

• 3. The superior vena cava is a vital structure in the human circulatory system that helps drain large amounts of deoxygenated blood from the head, eyes, neck, and upper limbs into the upper left chamber (atrium) of the heart.

• 4. The inferior vena cava is ultimately responsible the transport of almost all venous blood (deoxygenated) from the abdomen and lower extremities back to the right side of the heart for oxygenation.

• 5. The valves keep blood moving through the heart in right direction.

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Explanation:

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