Concept explainers
a.
To explain: The reason why the muscles of the legs of a child with Duchenne muscular dystrophy appear large.
Concept introduction: In the human body, the musculoskeletal system includes the muscles, bones, and joints. There are various abnormalities such as muscular dystrophy related to the muscles that are attached to bone and the internal organs. Muscular dystrophy includes a group of hereditary disorders that are characterized by the progressive weakness and the degeneration of muscle fibers. The most common type of muscular dystrophy is Duchenne muscular dystrophy (DMD).
b.
To explain: The reason why only boys are affected by Duchenne muscular dystrophy.
Concept introduction: In the human body, the musculoskeletal system includes the muscles, bones, and joints. There are various abnormalities such as muscular dystrophy related to the muscles that are attached to bone and the internal organs. Muscular dystrophy includes a group of hereditary disorders that are characterized by the progressive weakness and the degeneration of muscle fibers. The most common type of muscular dystrophy is Duchenne muscular dystrophy (DMD).
c.
To explain: The reason why a child with muscular dystrophy pulls himself up a flight of stairs.
Concept introduction: In the human body, the musculoskeletal system includes the muscles, bones, and joints. There are various abnormalities such as muscular dystrophy related to the muscles that are attached to bone and the internal organs. Muscular dystrophy includes a group of hereditary disorders that are characterized by the progressive weakness and the degeneration of muscle fibers. The most common type of muscular dystrophy is Duchenne muscular dystrophy (DMD).
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