Gross cellular effects from ionizing radiation exposure can include:

• A. Vacuolization and altered protoplasmic viscosity
• B. Vacuolization and changes in membrane permeability
• C. Altered protoplasmic viscosity and changes in membrane permeability
• D. Vacuolization, altered protoplasmic viscosity, and changes in membrane permeability

Answer: (D)

Gross cellular effects from ionizing radiation include multiple changes that can occur together: vacuolization in the cytoplasm, alterations in the viscosity or consistency of the protoplasm, and changes in the membrane’s permeability. Radiation creates reactive species by radiolysis of water, which damages lipids, proteins, and cytoskeletal structures. Lipid and membrane damage disrupts the barriers that regulate ion and water movement, leading to altered membrane permeability. Damage to cytoplasmic components and organelles changes how the cytoplasm flows and swells, producing vacuoles and an altered viscosity. Because these three changes can all happen in response to irradiation, describing them collectively provides the most complete picture of gross cytoplasmic effects.