Your circulatory system consists of blood, your __________ and blood vessels.

Your blood flows to almost every cell in your body through_____________.

We have _________types of blood vessels in our body.

Arteries carry blood to or away from the heart.

Arteries generally carry oxygenated or deoxygenated blood to the body.

Blood flowing through your arteries is or is not under great pressure.

____________carries blood away from your organs to the heart.

Veins are or are not under pressure returning blood from your organs to your heart.

Veins have large openings, or lumens, and have ___________ to keep blood flowing in the right direction back to the heart.

Arteries have a very small lumen, or opening, surrounded by thick____________.

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