There are changes in the immune system as it begins to wear out, and the body is more prone to infections and tissue damage, which may ultimately cause death.
Hormonal stress theory is aging in body hormonal system can lower resistance to stress and increase risks of diseases.
activity theory
The aging of the cells for each individual is programmed into the genes, and there is a preset number of possible rejuvenations in the life of a given cell.
Activity!
People support this theory because as people age some will exclude themselves from society, social activities and work, giving an opportunity for someone else to join the workforce.
Activity theory was the first social theory of aging, but only after the development of disengagement theory did it receive both its name and recognition as a distinct theory (Hiller & BArrow, 2007).
Hormonal stress theory is aging in body hormonal system can lower resistance to stress and increase risks of diseases.
activity theory
Yes, there is a genetic programming theory of aging (cell death).
The aging of the cells for each individual is programmed into the genes, and there is a preset number of possible rejuvenations in the life of a given cell.
David W. Weiss has written: 'Tumor antigenicity and approaches to tumor immunotherapy' -- subject(s): Immunological aspects, Immunological aspects of Tumors, Immunotherapy, Tumor antigens, Tumors 'Immunological parameters of host-tumor relationships' -- subject(s): Cancer, Cellular Immunity, Immunological aspects, Immunological aspects of Cancer, Immunological aspects of Tumors, Tumors
Jean Lindenmann has written: 'Immunological aspects of viral oncolysis' -- subject(s): Tumors, Immunological aspects, Immunological aspects of Tumors
Clonal selection and differentiation of lymphocytes provide the basis for immunological memory.
Changes in the makeup of the connective tissue alter the stability of body structures, causing a loss of elasticity and functioning, and leading to symptoms of aging.
Activity!
Human cells maintain their own seed of destruction at the chromosome level.
In biological theory, some biologists suspect the shortening of sacromeres causes aging.