ageing theories Flashcards
(4 cards)
1
Q
wear and tear theory
A
ageing results from a gradual deterioration of cells and tissue of the body due to accumulated damage over time
2
Q
hayflick limit
A
proposes that normal human cells can only divide a limited number of times (typically 40-60 times). before they stop dividing
3
Q
Cross linking theory
A
Proposes that the accumulation of cross links between large molecules like proteins and DNA within cells and tissues is a key factor in the ageing process
4
Q
Free radical theory
A
Suggests that ageing occurs because cells accumulate damage over time from free radicals
