The areas of the tongue sensitive to tastes. The classical theory about the physiology of taste recognizes the existence of four fundamental tastes - sweet, salty, sour and bitter - each being perceived by specific areas of the tongue by means of gustatory receptors, also known as taste buds.
Theories of Aging. Theories of Aging. Erik Erikson, who took a special interest in this final stage of life, concluded that the primary psychosocial task of late adulthood (65 and beyond) is to maintain ego integrity (holding on to one's sense of wholeness), while avoiding despair (fearing there is too little time to begin a new life course).
Two possible theories that could explain aging and death are programmed theory and damage theory. These theories are not exclusive and work in interaction with one another. Programmed theory is the idea that aging is genetically programmed to occur with time, and this process of deterioration eventually leads to death.amage Theories. We will let Wanda explain damage theories to us first. Damage theory is the idea that external or environmental forces gradually damage cells and organs, leading to aging and death.