Deoxygenated blood

Enters through the vena cava into the right atrium

It’s then pumped through a valve into the right ventricle chamber

And then up through the pulmonary valve into the pulmonary artery towards the lungs

Oxygenated blood

Enters through the pulmonary veins into the left atrium

It’s then pumped through a valve into the left ventricle

And then through the aortic valve and out of the aorta to the rest of the body