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Thin sac enclosing the heart


a wall of Muscle that divides the two sides of the heart


upper chamber of the heart


lower chamber of the heart


a tiny blood vessel that carries blood from the heart to the body

Coronary Arteries

carry or supply blood to the heart muscle


a blood vessel that carries blood back to the heart


the main and largest artery in the body


A tiny blood vessel that connects or links arteries to veins

Superior Vena Cava

Carries blood from the head and arms to the heart. (upper region)

Inferior Vena Cava

Carries blood from the trunk and legs to heart. (lower regions)

Carbon Dioxide

Blood that enter the right side of the heart carries this from the body.


Blood that leaves the left side of the heart carries this to the body.

Pulmonary Artery

carries blood from the heart to the lungs


phase when the heart relaxes and fills.


The heart contract and pumps during this phase.

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