This organ pumps blood to the body and is about the size of your fist.

• heart

• stomach

• liver

• brain

These vessels carry blood away from the heart and to the body's cells.

• veins

• capillaries

• arteries

• tubes

These vessels carry blood from the body back to the heart.

• veins

• arteries

• tubes

• capillaries

Tiny vessels that connect the larger vessels and help exchange nutrients/wastes with cells.

• veins

• arteries

• capillaries

• tubes

The waste gas made during cellular respiration that is carried by the blood.

• oxygen

• nitrogen

• carbon dioxide

• helium

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This gas is carried by the blood in the arteries and is used by cells in cellular respiration.

• oxygen

• nitrogen

• carbon dioxide

• hydrogen

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These cells are disc-shaped and carry oxygen to the body.

• white blood cells

• platelets

• skin

• red blood cells

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This side of the heart "receives" bad blood from the body.

• left

• right

• center

• upper

This side of the heart gets good blood from the Lungs and it Leaves this side out to the body.

• left

• right

• lower

• center

This is the largest artery of the body.

• vena cava

• ventricle

• atrium

• aorta