Question

Elucidate three physiological changes those occur due to ageing.

Hint:

While these structural declines are a natural part of aging, consistent endurance and resistance training can significantly slow down these processes and help maintain physical mobility.

Answer 1

Step 1: Understanding the Physiology of Aging:
Aging is a progressive biological process characterized by the gradual decline of cellular tissue function and structural efficiency across all major body systems.

Step 2: Elucidating Three Key Physiological Adaptations:

• Decline in Musculoskeletal Function (Sarcopenia and Osteopenia):
As the body ages, muscle mass gradually decreases, a condition known as sarcopenia. This is accompanied by a decrease in bone mineral density (osteopenia) caused by calcium loss, making bones more brittle and increasing the risk of osteoporosis and fractures.
• Reduction in Cardiovascular Efficiency:
The heart muscle and arterial walls become stiffer over time. This reduces the heart's stroke volume, lowers maximum cardiac output, and leads to a decline in overall oxygen processing capacity ($\dot{V}O_2\text{ max}$). The loss of arterial elasticity also leads to higher peripheral resistance, frequently causing high blood pressure.
• Reduction in Respiratory System Vital Capacity:
Aging reduces the elasticity of alveolar tissues and stiffens the rib cage. This weakens the respiratory muscles, leading to an increase in residual lung volume and a decrease in vital capacity, meaning less oxygen is taken in during physical exertion.