Which form part of the Law of Bergonie and Tribondeau?

• A. 1 and 2
• B. 1 and 3
• C. 1, 3, and 4
• D. 2 and 3

Answer: (C)

The main idea is that radiosensitivity depends on cellular characteristics: cells that divide rapidly, have a long future of potential divisions, and are less differentiated are more sensitive to radiation. The Law of Bergonie and Tribondeau states that radiosensitivity increases with reproductive activity (mitotic rate), increases with the length of the future cell division potential, and increases as differentiation decreases. Because all three factors contribute to how susceptible a cell is to radiation damage, the best answer is the option that includes statements about high mitotic activity, long future division potential, and low differentiation. This helps explain why tissues like bone marrow and intestinal epithelium are highly radiosensitive, while mature nerve tissue is relatively resistant.