Which of the following systems is arranged from the most radiosensitive to the least radiosensitive?

The most accurate arrangement of biological systems from the most radiosensitive to the least radiosensitive is based on how these systems respond to radiation exposure. The hematopoietic system, which includes blood cell production in the bone marrow, is quite sensitive to radiation. The cells within the hematopoietic system, especially the rapidly dividing progenitor cells, are among the most affected by radiation exposure.

Following the hematopoietic system is the gastrointestinal system, which also features rapidly dividing cells, particularly in the lining of the intestines. The gastrointestinal tract can sustain significant damage from radiation, leading to acute effects such as nausea and diarrhea if the dose is high enough.

Lastly, the cerebrovascular system is generally considered to be the least radiosensitive of the three. While radiation can cause damage to the central nervous system, the cells in the cerebrovascular system (like neurons) are not as quickly affected by radiation compared to the rapidly dividing cells in the hematopoietic and gastrointestinal systems. This hierarchy is critical for understanding the biological consequences of radiation exposure in clinical and medical contexts.