Question

where does blood flow to once the right ventricle contracts? pulmonary artery pulmonary vein right atrium left atrium

Explanation:

The right ventricle pumps de - oxygenated blood. The pulmonary artery is the vessel that carries blood away from the right ventricle to the lungs for oxygenation. The pulmonary vein brings oxygenated blood back to the heart (left atrium). The right atrium receives blood from the body (not pumped out by the right ventricle). The left atrium receives blood from the pulmonary vein.

Answer:

pulmonary artery