ERHS 450 Radiation Biology Exam 3 Questions & Answers 2024/2025
epithelium - ANSWERScells lining cavities and surfaces of the body
hematopoietic - ANSWERSradiation syndrome where death is generally associated with infection
reverting post mitotic (RPM) - ANSWERSclassification that includ...
mitotic death - ANSWERScells attempting to divide, rapid in tissues with rapid turnover; long latent
period and damage expressed slowly in in slow dividing tissues
apoptotic death - ANSWERStakes 4-6 hours for cell death when cells specific sensitivity for radiation
_________
necrosis - ANSWERSspontaneous, disorganized cell death
autophagy - ANSWERSintracellular degradation system that delivers cytoplasmic constituents to the
lysosome
senescence - ANSWERSthe condition or process of deterioration with age.
loss of a cell's power of division and growth.
bystander effect - ANSWERSthe phenomenon in which unirradiated cells exhibit irradiated effects as a
result of signals received from nearby irradiated cells
Law of Bergonie and Tribondeau - ANSWERSstates that tissues are more "radiosensitive" if cells are less
well differentiated, have a greater proliferative capacity, and divide more rapidly. More about
"responsiveness" than "sensitivity"
Cassarett's Classification of Tissue Radiosensitivity (I, II, III, IV) - ANSWERSI. Vegetative intermitotic cells
II. Differentiating inter mitotic cells III. Reverting post mitotic cells IV. Fixed post mitotic cells
Vegetative intermitotic cells - ANSWERSdivide regularly; no differentiation; erythroblasts, intestinal crypt
cells, germinal cells of the epidermis; HIGH SENSITIVITY.
Differentiating inter mitotic cells - ANSWERSdivide regularly, some differentiation between divisions;
myelocytes
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