PSY 216 Lecture 2: Chapter 2
Document Summary
* according to researchers, reducing caloric intake lowers the risk of premature death, slows down a wide range of normative age-related changes, and in some cases results in lower life spans than do normal diets. * a third variation of rate-of-living theories involves the hormonal regulatory system"s adaptation to stress. Although stress per se does not cause aging, the body"s ability to deal with it undergoes significant decline with age. * a relationship between these and diseases common in later life, including atherosclerosis, hypertension, diabetes, osteoporosis, and cognitive deficits. * the number of times cells can divide presumably places limits on the life span of a complex organism. * hayflick limit: cells grown in laboratory culture dishes undergo only a fixed number of divisions before dying, with the number of possible divisions dropping depending on the of the donor organism. * telomeres: the tip of the chromosomes that plays a major role in limiting the number of cell divisions.
