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A number of related causes
may
48
aging.Some cells of
the body have a fairly long life,but they can't be
49
when
they die.As a person ages,the
50
of brain cells and muscle
cells decreases.Other body cells 51 and are replaced by new
cells.In an aging person the 52
cells may not be as workable
or as capable of 53 as those of a young person.
Another
54
in aging may be changes within the cells
themselves.Some of the protein chemicals in cells are known to
55 with age and become less elastic(有弹性的).This is why
the skin of old people wrinkles (and becomes
56
This
is also the reason why old people 57
in height.There may be
other more
58
chemical changes in the cells.Some complex
cell chemicals,such as DNA and RNA,store and
59
infor-