By Edward J. Masoro PhD
This quantity presents the non-biologist an summary of what's identified in regards to the physiological bases of getting older. the writer examines the various simple theories and rising hypotheses underlying the molecular, mobile, and systemic strategies considering senescence. He addresses the traditional physiological adjustments that symbolize the getting older phenotype, and in addition considers the function of many age-associated ailments in getting old. Masoro synthesizes a much-needed "unified concept" of organic getting older to and is the reason how and why the physique grows into the situation we name "old." this article is meant for gerontology scholars in education, in addition to for human physiologists attracted to gerontology. outdated reproduction: what's the organic foundation of aging?? Why does getting older happen? This quantity will give you the reader with an summary of what we all know in regards to the biology of getting older. In a sincerely written and obtainable variety, the writer examines the various theories and hypotheses underlying the molecular, mobile, and systemic strategies fascinated about getting older. additionally thought of are the various age-associated illnesses and physiological adjustments that symbolize getting older, in addition to interventions -- from way of life variations to pharmacological remedies -- proposed to opposite age-related alterations. He then synthesizes a far wanted unifying notion of the organic foundation of getting older to assist us comprehend why we get older. This booklet is meant for college students education to develop into gerontologists in addition to biologists no longer familiar with the getting older box.
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Additional info for Challenges of Biological Aging
Holm, N. V, lachine, I. , Kannisto, V, Khazaeli, A. , Lango, V. , Zeng, Y, Manton, K. , & Curtsinger, J. W. (1998). Biodemographic trajectories of longevity. Science, 280,855-860. This page intentionally left blank 3 Why Aging Occurs I t has long been a puzzle why a phenomenon as detrimental to the individual as aging has not been eliminated by evolutionary forces but rather occurs almost universally in animals and plants. An intellectually satisfying solution to this puzzle is provided by the evolutionary theory of aging, which has been developed over the past 50 years.
A. Fisher and J. B. S. Haldane, had developed the foundations for the currently held evolutionary theory of aging. However, in their published papers, neither dealt directly with the question of why aging occurs. CURRENT EVOLUTIONARY THEORY OF AGING It was in 1946 that Peter Medawar published a paper based on the principles of population genetics that laid out the elements of the current evolutionary theory of aging. In that paper, he states that the basis for the evolution of aging is the fact that the force of natural Why Aging Occurs 39 selection weakens with increasing calendar age.
1. The high birth rate, which yielded the "Baby Boom Generation," heavily weighted the population structure in 1955 toward young people. However, it is projected that in 2010 that same group will cause the population of the United States to be weighted toward middle-aged people, and by 2025 (not shown in the figure) that generation will result in a population weighted in favor of old people. In addition, as stated earlier, the projected further increase in life expectancy during the 21st century will be another factor in the production of populations with high percentages of elderly, particularly the old-old.