Answer:
(i) Change in the nervous system: After age 25, everyone loses nerve cells. Gradually over time, this results in a reduced ability of nerve transmission, changing response time and coordination. The brain also shrinks in size, which does not significantly affect functioning except in the most extreme cases. These changes may also affect sleeping patterns somewhat by decreasing the length of total sleep time and REM sleep.
(ii) Maintains bone density: With advancement of age, bone density decreases as well generally leading to the rupture or osteoporosis. Physical exercises assist in maintaining bone mass and prevent osteoporosis. Bone growth gets stimulated with resistance exercises. With the help of regular exercise, the aged persons can increase their bone density as depicted by several research studies.
(iii) Changes in the endocrine system: The endocrine or metabolic system is responsible for changing food into energy. After age 25, everyone experiences approximately a 1% decrease per year in their metabolic rate. This overall slowing results in food being less well absorbed and utilized as well as a decrease in the overall metabolism of drugs. Consequences can include reduced stamina and reserves as well as greater susceptibility to drug toxicity.
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