heart

The blood returns to the heart as __ through two major veins: the superior vena cava and the inferior vena cava.

deoxygenated blood

The __ drains blood from above the diaphragm.

superior vena cava

The __ drains blood from below the diaphragm.

inferior vena cava

Blood enters the __ from the venae cavae.

right atrium

Blood flows through the __ valve into the right ventricle.

tricuspid

The __ pumps deoxygenated blood through the pulmonary valve into the pulmonary arteries.

right ventricle

Blood travels to the lungs via the right and left __.

pulmonary arteries

In the __, carbon dioxide is exchanged for oxygen.

lungs

Oxygen-rich blood returns to the heart through the __.

pulmonary veins

Blood enters the __ from the pulmonary veins.

left atrium

Blood flows through the __ valve into the left ventricle.

mitral

The __ pumps oxygenated blood out through the aortic valve into the aorta.

left ventricle