The most radiosensitive cells in the body are:

The most radiosensitive cells in the body are:

• A. Lymphocytes
• B. Nerve cells
• C. Muscle cells
• D. Epithelial cells

Answer: (A)

Radiosensitivity tracks how actively a cell divides and how differentiated it is. Lymphocytes are small immune cells that proliferate rapidly in response to threats, so their DNA is frequently replicated and less protected by differentiation. Ionizing radiation easily damages their DNA, leading to rapid cell death and a sharp drop in lymphocyte numbers. That makes them the most radiosensitive among the options. Nerve and muscle cells are highly specialized and divide rarely, so they’re relatively radioresistant. Epithelial cells do turn over, but their level of proliferative activity isn’t as extreme as lymphocytes, placing them below lymphocytes in sensitivity.

Radiosensitivity tracks how actively a cell divides and how differentiated it is. Lymphocytes are small immune cells that proliferate rapidly in response to threats, so their DNA is frequently replicated and less protected by differentiation. Ionizing radiation easily damages their DNA, leading to rapid cell death and a sharp drop in lymphocyte numbers. That makes them the most radiosensitive among the options. Nerve and muscle cells are highly specialized and divide rarely, so they’re relatively radioresistant. Epithelial cells do turn over, but their level of proliferative activity isn’t as extreme as lymphocytes, placing them below lymphocytes in sensitivity.