116. The Heart and Circulatory System: How They Work

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The heart's primary job is to pump blood to the whole body.

Your heart is about the size of your outstretched hand/fist.

Once the blood returns to the heart from the lungs it is bright red.

Your heart and liver are two main organs that keep you alive.

Your heart and lungs together make up your body’s circulatory or digestive system.

Your heart and lungs send oxygenated or deoxygenated blood to the rest of your body.

Your heart depends on electrical impulses to keep it beating in a normal rhythm.

Deoxygenated blood is dark red or “blue”.