Which tissues/organs are most sensitive to radiation?

Bone marrow and reproductive cells are considered the most sensitive to radiation due to their high rate of cell division and turnover. Tissues that are rapidly dividing are generally more vulnerable to the damaging effects of radiation exposure.

Bone marrow is crucial for producing blood cells, and since it constantly generates new cells, it has a heightened sensitivity to radiation. This can lead to significant health concerns, such as a decrease in blood cell counts (anemia, leukopenia, or thrombocytopenia), which can have serious implications for the body's ability to fight infection, clot blood, and deliver oxygen.

Reproductive cells, such as sperm and ova, also exhibit high sensitivity to radiation. Damage to these cells can lead to genetic mutations and reproductive issues, potentially impacting future generations.

In contrast, while teeth and enamel, jawbone and skin, as well as nerves and muscles can be affected by radiation, they do not experience the same level of sensitivity as bone marrow and reproductive cells due to their slower cell turnover rates. Therefore, the high sensitivity of rapidly dividing tissues like bone marrow and reproductive cells makes this option the most accurate answer.