___________ in the heart keep the blood moving in one direction.

Oxygen is carried through the body in our ___________.

______________ nodes may swell when we have an infection in our body.

Our windpipe is known as the _______________.

In normal cases we have ________ lungs in our body.

Urine is produced when our _______________ filter waste from the blood.

_____________ is a virus that attacks our immune system.

In normal conditions we have _______ kidneys.

A __________ is designed to prevent us from getting a virus.

The __________ is the largest artery in the body.

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