AP BIOLOGY

Detailed explanation-1: -Pulmonary veins: Your pulmonary veins do the opposite job of your pulmonary arteries. They collect oxygen-rich blood and carry it from your lungs to your heart. This blood empties into your heart’s top left chamber (left atrium).

Detailed explanation-2: -The lung veins sometimes referred to as the pulmonary veins, are blood vessels that transfer freshly oxygenated blood from the lungs to the left atria of the heart.

Detailed explanation-3: -Explanation of the correct answer: The pulmonary vein is the largest vein. It plays an essential role by receiving blood that has been oxygenated in the alveoli and returning it to the left atrium. This vein transfer oxygenated blood from the lungs to the heart.

Detailed explanation-4: -Oxygen-rich blood flows from the lungs back into the left atrium (LA), or the left upper chamber of the heart, through four pulmonary veins.

Detailed explanation-5: -Pulmonary vein is the only vein that carries oxygenated blood as they carry blood from lungs to the heart and, pulmonary artery is the only artery that carry deoxygenated blood.