Tissues with cells that are undergoing division are ______ sensitive to radiation-induced damage.

Tissues with cells that are undergoing division are more sensitive to radiation-induced damage because actively dividing cells are in a state of heightened metabolic activity, which makes them more vulnerable to the effects of radiation. During cell division, DNA is replicated, and any damage caused by radiation can interfere with this process, potentially leading to mutations or cell death.

Rapidly dividing tissues, such as those found in the bone marrow, skin, and the gastrointestinal tract, are particularly sensitive because they have a high turnover rate. As a result, even small doses of radiation can have significant effects on these tissues, leading to potential health complications. This increased vulnerability is why the correct response highlights the greater sensitivity of actively dividing cells to radiation.