Essay about Biological And Physical Process Of Aging
Aging as a passive process involves the breakdown of structures and the resulting slowing of functions. At the molecular level, passive aging is seen as the degeneration of the elastin and collagen proteins of connective tissues. These proteins are primarily responsible for the smoothness and …show more content…
The active process of aging involves new activities or the appearance of new substances. This process actually begins at birth, as certain cells begin to die. As the cells die, old structures are destroyed, and new ones will take their place. The number of neurons in the fetal brain, for example, is halved as only certain ones are spared from death. The appearance of lipofuscin may also be considered an active process of aging, although it results from the passive breakdown of lipids. Another example would be autoimmunity, in which the immune system turns against the body, attacking its own cells as though they were harmful invading organisms.
While the physical changes that the body undergoes due to aging will vary from person to person, certain evidences can be expected to appear in specific phases of life. As mentioned before, brain cells will begin to die at birth. By the age of 10, the thymus has begun to shrink. Sexual maturity occurs in the teens, while the peak of male sexuality will be in the early twenties. Peak muscle strength will be noted around the age of 25, while peak hair thickness is in the thirties. Also in the thirties: the skin becomes less elastic, the heart muscle thickens, and there is a decline in hearing and height, and the peak of female sexuality