Front

This organ is a _____________.

Back

heart

Front

Bones, blood vessels, muscles, chambers

Back

blood vessels

Front

We breathe this in.

Back

oxygen

Front

Your heart is the size of a _______.

Back

fist

Front

Chambers in the heart?

Back

4

Front

The _____________ system flows blood through the body.

Back

circulatory

Front

Your heart beats about ____________ times daily.

Back

115,000

Front

Laughing is good for your heart.

Back

True