Physiological Development Flashcards
3 Biological Types of Ageing
1) Primary
2) Secondary
3) Tertiary
Primary Ageing
Inevitable biological ageing
Secondary Ageing
Experienced by most but not necessarily all
Tertiary Ageing
Terminal drop, rapid loss occurring shortly before death
2 Main Theories of Ageing
1) Programmed Theories
2) Stochastic Theories
Programmed Theories
Biological mechanism where ageing is a function of genetically based program
3 Examples of Programmed Theories
1) Time clock
2) Immunological
3) Evolutionary
Time Clock Theory
Limited number of times cell can divide
Immunological Theory
Immune system only works for period of time
Evolutionary Theory
Live long enough to raise youth
Stochastic Theories
Focus on both internal and external factors believed to result in random changes and damage
3 Examples of Stochastic Theories
1) Wear & Tear
2) Rate of Living
3) Free Radical
Wear & Tear Theory
Ageing use and deterioration of cells (there is some support but what about exercise)
Rate of Living
Body can only do so much work
Apoptsosis
Programmed cell death