Question

multiple choice question
the oxygenated blood leaves the lungs through the _____ and returns to the _____.
pulmonary veins; left ventricle
pulmonary arteries; left atrium
pulmonary veins; left atrium
pulmonary arteries; left ventricle

Explanation:

• Pulmonary veins: These vessels carry oxygenated blood. In the pulmonary circulation, after oxygen - carbon dioxide exchange in the lungs, the oxygenated blood is transported.
• Left atrium: It is the chamber of the heart that receives the oxygenated blood from the lungs. The left atrium then pumps the blood into the left ventricle (through the mitral valve) for further circulation to the rest of the body.
• Pulmonary arteries: Carry deoxygenated blood from the right ventricle to the lungs. So, options with pulmonary arteries as the first blank are incorrect.
• Left ventricle: Receives blood from the left atrium (not directly from the lungs).

Answer:

pulmonary veins; left atrium