The heart is a hollow muscle about the size of your fist.  The heart has four chambers.  There are two chambers on the left side and two chambers on the right side.  Each chamber has a specific job to do.  Review the heart below.

Carbon dioxide rich blood is shown in blue and oxygen rich blood is shown in red.  The upper right chamber or Right Atrium receives blood from the veins through the Vena Cava.  Blood from the veins contains little oxygen and is carbon dioxide rich. The blood next travels to the lower right chamber or Right Ventricle which pumps the blood to the lungs.

The lungs remove the carbon dioxide and replenish the blood with oxygen.  The blood returns to the heart in the upper left chamber or Left Atrium.  The blood then travels to the lower left chamber or Left Ventricle which pumps the blood through the Aorta to all the parts of the body.

Complete the questions below.

The heart is a muscle about the size of your .

Carbon dioxide rich blood travels from the body into the heart through the  .

The Right receives carbon dioxide rich blood from the body.

Blood travels from the Right Atrium to the to be pumped to the lungs.

Blood from the Right Ventricle is rich.

The lungs replace the carbon dioxide with .

Oxygen rich blood is returned to the heart into the Left .

Blood passes through the Left Atrium to the .

The Left Ventricle pumps oxygen rich blood through the to all parts of the body.



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The Heart, a Hollow Muscle