Biological Change (slides) Flashcards
1
Q
Describe the wear and tear theory?
A
aging occurs because of the system simply wearing out over time.
repeated daily use of the body causes breakdown
2
Q
Cellular Aging Theory
A
cells have a finite number of replications.
3
Q
Immunological Theory
A
immune system becomes defective/less efficient
loss of T-cells reduces ability to fight infection
4
Q
Free-radical Theory
A
Free radicals are unstable atoms or molecules which contain unpaired electrons (weak bonds)
Attack nearby healthy cells to replace electron – causes chain reaction (oxidative stress
