What type of tissues experiences loss as we age, leading to weakened muscles?

The correct response is focused on muscle cells because, as individuals age, there is a natural decline in the size and number of muscle fibers. This process, known as sarcopenia, leads to a noticeable decrease in muscle mass, strength, and overall physical function. The loss of muscle cells results in not only reduced muscle strength but also a decrease in metabolic rate and physical mobility, which can increase the risk of falls and frailty in older adults.

In addition to muscle cells, other tissues such as cartilage, nerve tissues, and skin cells also undergo changes with age, but they do not primarily contribute to the overall weakening of muscles in the same direct manner as muscle cells do. Cartilage may deteriorate, affecting joints; nerve tissues may show degeneration or reduced signaling efficiency; and skin cells may become thinner and less elastic. However, the specific loss of muscle cells is most directly linked to the weakening of muscles themselves, thereby making it the most relevant answer in the context of aging.