Path of Blood present in vessels called __________?
Correct answer: B. Lumen
- A. Capillaries
- B. Lumen
- C. Platelates
- D. Plasma
Explanation
The lumen is the hollow internal space of a blood vessel through which blood flows. Capillaries are vessels, whereas plasma is the liquid part of blood and platelets are cellular fragments, so those terms do not name the passage itself. Students often choose capillaries because they are the smallest vessels, but the question asks for the internal channel.
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