Question at position 6 Which carries oxygenated blood from the lungs to the heart?Pulmonary arteriesPulmonary trunkInferior vena cavaSuperior vena cavaPulmonary veins

Question

Question at position 6 Which carries oxygenated blood from the lungs to the heart?Pulmonary arteriesPulmonary trunkInferior vena cavaSuperior vena cavaPulmonary veins

BlackTom AI · Accepted Answer

Pulmonary veins transport oxygenated blood from the lungs into the left atrium of the heart.

1. Relevant knowledge points and concepts
- Blood circulation is divided into pulmonary (heart↔lungs) and systemic (heart↔body) circuits.
- In the pulmonary circuit, deoxygenated blood is pumped from the right ventricle to the lungs via the pulmonary trunk and pulmonary arteries. Gas exchange in the lung capillaries loads oxygen onto the blood and removes CO2.
- Oxygenated blood returns from the lungs to the heart via the pulmonary veins and enters the left atrium, ready to be pumped out into the systemic circulation by the left ventricle.

2. Step-by-step reasoning
- Start at the right side of the heart: right ventricle → pulmonary trunk → splits into right and left pulmonary arteries → these arteries carry deoxygenated blood into the lung capillaries.
- In the lungs, gas exchange occurs: blood picks up O2 and releases CO2.
- Oxygen-rich blood leaves the alveolar capillaries through pulmonary venules which coalesce into pulmonary veins.
- Pulmonary veins deliver this oxygenated blood directly into the left atrium of the heart.

3. Calculations
- No numerical calculations are required for this conceptual question.

4. Why the correct answer is correct
- Pulmonary veins are anatomically and functionally defined by carrying oxygenated blood from the lungs to the heart (left atrium). They are the only veins in normal adult circulation that consistently carry oxygen-rich blood.

5. Why the other options are incorrect
- Pulmonary arteries: carry deoxygenated blood from the right ventricle to the lungs, not oxygenated blood back to the heart.
- Pulmonary trunk: the main arterial trunk leaving the right ventricle that gives rise to the pulmonary arteries; it carries deoxygenated blood away from the heart.
- Inferior vena cava and Superior vena cava: these systemic veins return deoxygenated blood from the body to the right atrium, not oxygenated blood from the lungs.

6. Conclusion
- Therefore, the correct choice is Pulmonary veins, which matches the provided answer.

Question at position 6 Which carries oxygenated blood from the lungs to the heart?Pulmonary arteriesPulmonary trunkInferior vena cavaSuperior vena cavaPulmonary veins单项选择题

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