ADA NBDHE Dental Hygienist

Answer: D - There are five laws of radio-sensitivity: 1) The more mature the cell, the more it resists radiation; 2) The younger the tissues and organs, the greater the radio-sensitivity; 3) The higher the metabolic activity of the cell, the higher its radio-sensitivity; 4) The higher the proliferation rate for cells and the growth rate for tissues, the higher their radio-sensitivity; and 5) The more differentiated the cells, the more resistant it is to biologic effects of radiation.