EESA10H3 Lecture Notes - Lecture 6: Tumor Suppressor Gene, Burn, Immune System
Document Summary
Radiation and human health: we can not escape radiation, background radiation - natural radioactivity in the earth and by cosmic rays from outer space, can not be controlled. Ionized radiation: very dangerous, high energy, breaks bonds, non-ionized radiation. Health effects from exposure to radionuclides: stochastic health effects - chronic. Increase levels of exposure make these effects more likely to occur but do not influence the type or severity of the effect: non-stochastic health effects - acute, short term, high level of exposure. Increase levels of exposure make these effects more severe. Changes in dna- mutations: teratogenic (fetus most sensitive in 8-15 week of pregnancy, smaller head or brain size, poorly formed eyes, and mental retardation, genetic (passed from parent to child) Radiation sickness: nausea, weakness, hair loss, skin burn or diminishing organ function, premature aging, and death. Cancer- uncontrolled growth of cells: damage at the cellular or molecular level.
