A 12-year-old girl who had developed polio at 4 years of age, had atrophic leg muscles. Themost likely predisposing mechanism is:Select one:a. Ishemicb. Disusec. Denervationd. MalnutritionClear my choice
Question
A 12-year-old girl who had developed polio at 4 years of age, had atrophic leg muscles. Themost likely predisposing mechanism is:Select one:a. Ishemicb. Disusec. Denervationd. MalnutritionClear my choice
Solution
The most likely predisposing mechanism for atrophic leg muscles in a 12-year-old girl who had developed polio at 4 years of age is:
c. Denervation
Here's why:
Polio is a viral disease that can damage the nervous system and cause paralysis. When the poliovirus infects and destroys motor neurons, it leads to muscle weakness and atrophy. This process is known as denervation.
Denervation means the loss of nerve supply to a muscle. Without signals from the neurons, the muscle cells do not get stimulated to contract and thus start to shrink or 'atrophy'. This is a common consequence of diseases like polio that affect the nervous system.
So, in the case of this girl, her polio at a young age likely caused denervation in her leg muscles, leading to their atrophy.
The other options are less likely:
a. Ischemic: This refers to a lack of blood supply, which is not the primary issue in polio. b. Disuse: While disuse can cause muscle atrophy, it's unlikely to be the primary cause in a child who had polio. d. Malnutrition: While malnutrition can contribute to muscle atrophy, it's not the primary cause in polio, which directly affects the nervous system.
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