Causes And Effects Of Aging

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As you age all your vital organs begin to lose some function. Aging happens in all the body cells, organs and tissues, and these changes affect the functioning of all body systems. Physiological changes that take place in the human body leading to senescence, the decline of biological functions and of the ability to adapt to metabolic stress. In humans the physiological developments are normally accompanied by psychological and behavioral changes, and other changes, involving social and economic factors, also occur.
The effects of aging on the respiratory system are like those that occur in other organs: maximum function gradually declines. These changes in respiratory mechanisms are primarily a reflection of the increased stiffness of the bony cage of the chest and decreased strength of the muscles that move the chest during respiration. Age-related changes in the lungs include:
• Decreases in peak airflow and gas exchange
• Decreases in measures of lung function such as vital capacity (the maximum amount of air that can be breathed out following a maximum inhalation)
• Weakening of the respiratory muscles
• Decline in the effectiveness of lung defence mechanisms
These changes contribute somewhat to an older person's reduced ability to do intense exercise, especially intense aerobic exercise, such as running, biking, and mountain climbing. However, age-related decreases in heart function may be a more important cause of such limitations.
The brain and nervous system are
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