The heart is an ____ in your chest made up of ____ chambers. The top chambers are called the ____ and the bottom chambers are the ____. The heart is protected by the ____. The heart acts like a ____, pushing blood around the body. This happens because the ____ in the wall of the heart regularly contract, squeezing the blood. Blood travels away from the heart in blood vessels called ____ and returns to the heart in blood vessels called ____. Blood travels to the lungs to pick up ____ and then travels back to the heart. The blood then leaves the heart again to go to the body, delivering the oxygen to the ____ of the body.

The Heart

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