These carry blood AWAY from your heart.

The human heart has how many chambers?

These carry oxgenated blood BACK to the heart.

This is the largest artery in your body.

These are what keeps blood flowing in one direction in and out of the heart.

These cells are what attack infection in the body.

Alveoli need to be extremely thin so that...

The voice box is found in the...

What would happen if the trachea became blocked?

Below the trachea, the ___________ form the first branches into the lungs.

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