Radiology Chapter 4: Radiation Biology Questions and Answers Rated A+

Radiology Chapter 4: Radiation Biology Questions and Answers Rated A+ What are late effects of radiation exposure? Cancer, cataracts, and fibrosis How do radioprotectors work? They reduce the extent of radiation damage to normal tissues What is the main cause of radiation-induced cancer? DNA mutations resulting from radiation exposure How does radiation exposure affect the lungs? It can lead to fibrosis, inflammation, and long-term lung damage What is the principle behind the use of fractionation in radiation therapy? To allow normal tissues to repair between doses while maintaining tumor destruction 2 How does radiation interact with water molecules in the body? It creates free radicals, which can then cause cellular damage What is the primary mechanism of radiation-induced cell death? Damage to DNA, leading to cell cycle arrest and apoptosis What is the difference between acute and chronic radiation effects? Acute effects appear shortly after exposure, while chronic effects develop over time What is the role of the cell nucleus in radiation damage? It houses the DNA, and radiation-induced damage to DNA leads to cell dysfunction or death What is the impact of radiation on the gastrointestinal system? It can cause nausea, vomiting, and damage to the intestinal lining What is the main concern with radiation exposure during pregnancy? It can affect fetal development and increase the risk of birth defects 3 What is the concept of the "linear no-threshold" model in radiation risk? It assumes that any amount of radiation exposure carries a risk of causing harm without a safe threshold What is the primary target of ionizing radiation in a cell? DNA What is the most sensitive phase of the cell cycle to radiation? M phase What happens to a cell when it experiences direct DNA damage from radiation? The cell may undergo mutation or death How does radiation affect DNA molecules in a cell? It can cause single- or double-strand breaks What is the term for the process where a cell repairs itself after radiation-induced damage? DNA repair 4 What is the effect of radiation on rapidly dividing cells? They are more likely to be damaged or killed What is the term used for the harmful effects of radiation on the reproductive cells? Genetic mutations