When the oxygenation of a cell increases, the cell's sensitivity to sparsely ionizing radiation will:

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Multiple Choice

When the oxygenation of a cell increases, the cell's sensitivity to sparsely ionizing radiation will:

Explanation:
Higher oxygen levels make cells more vulnerable to sparsely ionizing radiation because oxygen helps fix radiation-induced damage. Low-LET radiation creates free radicals that can be repaired if oxygen isn’t around, but when oxygen is present it reacts with those radicals to form stable, permanent DNA lesions. This “fixation” of damage means more cell death at the same dose, so increasing oxygenation raises radiosensitivity. It’s why well-oxygenated tissues respond more to such radiation, while hypoxic areas are more resistant.

Higher oxygen levels make cells more vulnerable to sparsely ionizing radiation because oxygen helps fix radiation-induced damage. Low-LET radiation creates free radicals that can be repaired if oxygen isn’t around, but when oxygen is present it reacts with those radicals to form stable, permanent DNA lesions. This “fixation” of damage means more cell death at the same dose, so increasing oxygenation raises radiosensitivity. It’s why well-oxygenated tissues respond more to such radiation, while hypoxic areas are more resistant.

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