A vein possesses a large lumen because:
Correct answer: D. Tunica media is a thin coat
- A. Tunica media and tunica externa form a single-coat
- B. Tunica interna and tunica media form a single coat
- C. Tunica interna, tunica media, and tunica externa are thin
- D. Tunica media is a thin coat
Explanation
Therefore, the correct answer to the question "A vein possesses a large lumen because" is D) tunica media is a thin coat.
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The circulatory system covers the chambers, valves and conducting pathway of the human heart, along with the cardiac cycle and control of heartbeat. It compares arteries, veins and capillaries by structure and function, and explains how the lymphatic system returns tissue fluid, transports absorbed fats and supports immunity.
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