Which of the following anatomical structures has a low radiosensitivity?

The brain is considered to have low radiosensitivity compared to other anatomical structures. This is primarily due to the type of cells that make up brain tissue. Neurons, the primary cells in the brain, do not divide frequently or at all after a certain point in development, which makes them less susceptible to radiation damage. In contrast, tissues with high cellular turnover, such as the intestines and skin, are more vulnerable to the harmful effects of radiation because they contain rapidly dividing cells.

Additionally, while the liver has a complex regeneration ability, it also contains a significant number of non-dividing cells and can be somewhat resilient to radiation damage. However, it is not as resistant as brain tissue, which is why the brain is classified as having low radiosensitivity. Understanding the sensitivity of various tissues is crucial in fields such as radiology and oncology, as it informs treatment planning to minimize damage to healthy tissues while targeting cancerous cells.