Older adults tend to lose muscular strength because muscle cells
get larger in size.
attach to the nervous system.
increase in number.
get smaller in size.
The correct answer and explanation is :
The correct answer is: get smaller in size.
Explanation:
As individuals age, their bodies undergo several changes, and muscle loss is one of the most noticeable effects, particularly in older adults. The phenomenon of muscle loss is referred to as sarcopenia, which involves a gradual decrease in muscle mass and strength. The primary reason for this loss is that muscle cells, known as muscle fibers, shrink in size rather than increase. This reduction in muscle fiber size leads to a decline in overall muscle strength.
There are several factors that contribute to the shrinkage of muscle cells as we age:
- Decreased Physical Activity: As people age, they tend to become less physically active, leading to disuse of muscles. This lack of stimulation causes muscle fibers to shrink and weaken over time.
- Changes in Hormone Levels: Hormones like testosterone, growth hormone, and estrogen play a significant role in muscle growth and repair. As these hormone levels decline with age, muscle regeneration slows down, and the existing muscle fibers decrease in size.
- Neurological Changes: The nervous system plays a crucial role in maintaining muscle mass and strength by sending signals to the muscles to contract. With age, there is a reduction in the efficiency and number of motor neurons that control muscle fibers. This leads to fewer muscle fibers being recruited during physical activity, further contributing to muscle atrophy.
- Protein Synthesis Decline: Muscle tissue constantly undergoes processes of protein synthesis (building muscle) and protein breakdown (breaking down muscle tissue). As people age, the rate of protein synthesis decreases, while protein breakdown remains the same, leading to muscle loss over time.
In conclusion, the loss of muscular strength in older adults is mainly due to the shrinking of muscle fibers, which diminishes their size and overall functional capacity. To combat this, regular exercise, especially strength training, along with proper nutrition, can help mitigate muscle loss and improve strength in older adults.