During which period are the ovaries most radiosensitive?

The ovaries are most radiosensitive during fetal growth and early childhood due to rapid cell division and the developing nature of the tissues in these stages. During fetal growth, the reproductive organs are still forming, and the cells are highly active in terms of mitosis. This high rate of proliferation makes them particularly vulnerable to radiation damage, as radiation can disrupt the cellular processes essential for proper development.

Similarly, in early childhood, while the ovaries are already developed, they are still in a state of growth and maturation, leaving them susceptible to the effects of ionizing radiation.

Both periods exhibit heightened sensitivity because the cells in the ovaries are undergoing significant changes, leading to increased likelihood of mutations and damage when exposed to radiation. This is contrasted with later stages of development, where the rate of division decreases, contributing to a lower degree of radiosensitivity. Therefore, the correct answer recognizes both fetal growth and early childhood as critical periods regarding the radiosensitivity of the ovaries.