lec3_pysiological_aging_and_sensory_changes_p

lec3_pysiological_aging_and_sensory_changes_p - Lecture 3...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 3 “LONGEVITY AND PHYSIOLOGICAL AGING” LIFE SPAN AND THE AGING PROCESS * Trends in life expectancy: * Life expectancy * Longevity The Concept of Age * Maximum life span: The longest that any member of a given species can live under ideal conditions - humans about 120 years, giant sea tortoise live about 160 years * Life Expectancy: How long, on average, one is expected to live, 1900à 50% born were expected to reach 50 * Survivor Effects: The phenomenon that members of a population that live the longest are expected to live even longer than those who did not survive * Gender and Life Expectancy: women live longer 1970 1985 2020 Woman: 71 78.2 82.0 Men: 65.5 71.2 74.2 * Why the gender difference? Health behavior habits, genetics (XX, XY), hormones (heart disease is caused by lack of estrogen=men and after medopause) * Ethnicity and Life Expectancy Men Women All 72.6 78.9 White 73.4 79.6 Black 65.4 74.0 LIFE SPAN AND THE AGING PROCESS * Predicting individual longevity * Biomarkers
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
* Declines in immune system functioning * Blood levels of DHEA: immune disfunction, increase cancer, Heart Disease men, Ostiopersis. Women Biological Theories of Aging * Programmed Theories * senescence is directed by genetic factors (e.g., there are old age genes that are turned on later in life). * Random Event Theories * senescence is result of random or unplanned damage LIFE SPAN AND THE AGING PROCESS * Genetic-programming theories * Implies that environmental influences * Decline or failure may be from programmed senescence, when specifi genes “switch off” * Theories of biological aging * * Programmed senescence * Endocrine theory * Immunological theory * Telomere theory Support for Programmed Theories * Hayflick Limit: Limit # of times a cell will replicate Limits vary by species; limit in humans ~50 * Maximum life span of species differs * Manifestations of aging differ among species * Genetic mutations cause accelerated aging disorders (progeria, Downs syndrome)
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 9

lec3_pysiological_aging_and_sensory_changes_p - Lecture 3...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online