VSR-0010
QUESTION
Most radiosensitive cells are?
OPTIONS
(A) Stem cells of hematopoietic system
(B) Nerve and muscle cell
(C) Bone, cartilage
(D) All of the above
ANSWER
(A) Stem cells of hematopoietic system
EXPLANATION
Undifferentiated hematopoietic stem and progenitor cells divide actively and are highly sensitive to ionizing radiation. Mature nerve and muscle cells are relatively radioresistant, as are more differentiated bone and cartilage cells; therefore the alternatives and 'all' do not describe the most sensitive group.
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