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Aging is associated with a decline in strength, with most of the decline occurring after age 50. The loss of strength is due, in part, to a loss of muscle mass; this age-related loss of muscle mass is termed

a. sarcopenia.
b. muscle fiber hypotrophy.
c. muscle fiber hyperplasia.
d. None of these is correct.

User Jose Lora
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Final answer:

Sarcopenia is the age-related loss of muscle mass that contributes to a decline in strength and is typically observed after age 50.

Step-by-step explanation:

The age-related loss of muscle mass is termed sarcopenia. This condition is a gradual decline in the ability to maintain skeletal muscle mass which becomes noticeable after the age of 50 and can have a significant impact on strength and mobility. As muscles age, muscle fibers die off and are replaced by connective tissue and adipose tissue, which cannot produce powerful muscular contractions. The result is a reduction in muscle strength and endurance, leading to greater difficulty in activities requiring posture, mobility, and balance. Sarcopenia may be attributed to factors such as the decline of satellite cells that regenerate muscle fibers, and a decrease in the sensitivity to growth factors necessary to maintain muscle mass. Despite being irreversible, the effects of sarcopenia can be delayed through regular exercise, which can lead to an increase in the number of cellular mitochondria, capillary density, and the mass and strength of connective tissue.

User Stokely
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