A Level Biology Practice Exam

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What type of blood does the pulmonary vein carry?

Deoxygenated blood from the heart to the body
Oxygenated blood from the lungs to the heart
Mixed blood from the heart to the lungs
Carbon dioxide-rich blood from the body to the lungs

The correct answer is: Oxygenated blood from the lungs to the heart

The pulmonary vein carries oxygenated blood from the lungs to the heart. After being oxygenated in the alveoli of the lungs, the blood is then transported back to the left atrium of the heart through the pulmonary veins. This process is crucial for the circulatory system, as it allows the heart to pump oxygen-rich blood to the rest of the body, ensuring that tissues receive the necessary oxygen for cellular respiration and metabolic processes. The significance of this is highlighted by the fact that the pulmonary veins are the only veins in the body that carry oxygenated blood, while all other veins typically carry deoxygenated blood. Understanding this role of the pulmonary veins emphasizes their importance in maintaining effective gas exchange and efficient cardiovascular function.