Which of the following cell types are most sensitive to a dose of 6 Gy of radiation?

Which of the following cell types are most sensitive to a dose of 6 Gy of radiation?

• A. Muscle cells
• B. Epithelial cells
• C. Brain cells
• D. Crypt cells of Lieberkuhn

Answer: (D)

The crypt cells of Lieberkuhn are located in the intestinal lining and are considered highly sensitive to radiation due to their rapid division and turnover rate. These cells are stem cells responsible for generating the epithelial cells that populate the intestine, and they continuously replicate to replace cells that are lost due to the harsh environment of the digestive tract. Because of their rapid proliferation, they are more susceptible to the damaging effects of radiation, which can cause cell death or impair their ability to regenerate the intestinal lining. In contrast, muscle cells typically have a slower rate of division, making them less sensitive to radiation exposure. Epithelial cells, while also sensitive, do not undergo division as rapidly as the crypt cells. Brain cells, particularly mature neurons, are among the least sensitive because they are generally post-mitotic and do not divide frequently, making them less affected by radiation compared to rapidly dividing tissues like those found in the intestinal lining. Thus, the high sensitivity of crypt cells of Lieberkuhn to radiation at a dose of 6 Gy highlights their role and importance in maintaining the health and integrity of the intestinal epithelium during radiation exposure.

The crypt cells of Lieberkuhn are located in the intestinal lining and are considered highly sensitive to radiation due to their rapid division and turnover rate. These cells are stem cells responsible for generating the epithelial cells that populate the intestine, and they continuously replicate to replace cells that are lost due to the harsh environment of the digestive tract. Because of their rapid proliferation, they are more susceptible to the damaging effects of radiation, which can cause cell death or impair their ability to regenerate the intestinal lining.

In contrast, muscle cells typically have a slower rate of division, making them less sensitive to radiation exposure. Epithelial cells, while also sensitive, do not undergo division as rapidly as the crypt cells. Brain cells, particularly mature neurons, are among the least sensitive because they are generally post-mitotic and do not divide frequently, making them less affected by radiation compared to rapidly dividing tissues like those found in the intestinal lining.

Thus, the high sensitivity of crypt cells of Lieberkuhn to radiation at a dose of 6 Gy highlights their role and importance in maintaining the health and integrity of the intestinal epithelium during radiation exposure.