Paper 1 · People, Development and Environment
Which of the following body parts is most likely to be affected by nuclear radiation during the early stages of exposure?
ASkin
BBones
CBone marrow ✓ Correct
DNone of the above
Correct answer: (C) Bone marrow — Bone marrow is most likely to be affected early, so that is the answer.
Explanation
★Bone marrow is most likely to be affected early, so that is the answer.
★Bone marrow makes the body's blood cells and divides rapidly.
★Rapidly dividing cells are the most sensitive to radiation.
★So bone marrow is hit first in the early stages of exposure.
★The skin and bones are affected less rapidly at this stage.
★So the answer is bone marrow.
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