Final answer:
The most radiosensitive cells in the human body are found in bone marrow, intestinal tissue, and reproductive organs due to their high rate of cell division, with bone marrow cells being particularly sensitive. Radiation treatment for cancer is effective because cancer cells divide rapidly and are therefore more vulnerable to radiation effects.
Step-by-step explanation:
The most radiosensitive cell in the human body is typically found in tissues that are most affected by large, whole-body exposures such as bone marrow, intestinal tissue, and reproductive organs. Among these, the bone marrow cells are known for their high sensitivity to radiation because they contain rapidly dividing cells. The sensitivity of these cells is the reason why radiation is effective in cancer treatment since cancer cells also divide rapidly, making them more vulnerable to radiation compared to normal cells. Studies on mice and fruit flies have shown varying effects of radiation with different exposure times, but it is generally believed that the mice model, which indicates a low risk from low doses and a high risk when natural repair mechanisms are overwhelmed, is more similar to humans.