Which tissue is described as among the most radiosensitive, representing a critical site of damage during exposure?

Which tissue is described as among the most radiosensitive, representing a critical site of damage during exposure?

• A. Muscle
• B. Brain
• C. Cartilage
• D. Bone marrow

Answer: (D)

Radiosensitivity tracks how actively a tissue’s cells divide and replace themselves. Bone marrow contains大量 hematopoietic stem cells that are continuously mitotic to produce blood cells. Ionizing radiation damages these rapidly dividing cells, leading to suppression of red cells, white cells, and platelets, which can cause anemia, infection, and bleeding. Because of this critical role in sustaining life through blood cell production, bone marrow is among the most radiosensitive tissues and a key site of damage during exposure. In comparison, muscle, cartilage, and especially the brain have much lower turnover or largely post-mitotic cells, making them relatively more resistant to acute radiation injury.

Radiosensitivity tracks how actively a tissue’s cells divide and replace themselves. Bone marrow contains大量 hematopoietic stem cells that are continuously mitotic to produce blood cells. Ionizing radiation damages these rapidly dividing cells, leading to suppression of red cells, white cells, and platelets, which can cause anemia, infection, and bleeding. Because of this critical role in sustaining life through blood cell production, bone marrow is among the most radiosensitive tissues and a key site of damage during exposure. In comparison, muscle, cartilage, and especially the brain have much lower turnover or largely post-mitotic cells, making them relatively more resistant to acute radiation injury.