Heart

Oxygenated blood from the lungs enters the heart through the PULMONARY VEIN

It enters the LEFT

ATRIUM which then

contracts

And forces the blood

through a VALVE into

the LEFT VENTRICLE

The LEFT VENTRICLE

then contracts, forcing

the blood through

another VALVE

The blood then travels

by the AORTA

around the body

Deoxygenated blood from the body enters the heart through the

VENA CAVA

It enters the RIGHT

ATRIUM which

then contracts

And forces the blood

through the VALVE into

the RIGHT VENTRICLE

The RIGHT VENTRICLE

then contracts,

forcing the blood

through another VALVE

The blood then travels

by the PULMONARY

ARTERY to the lungs