Question

unit 2 - challenge 2.3: the muscular

what is duchenne muscular dystrophy (dmd)?

a.) a progressive weakening of skeletal muscles due to a lack of
dystrophin
b.) an involuntary muscle contraction
c.) a condition caused by potassium deficiency
d.) a minor muscle tear that heals quickly

Explanation:

Duchenne muscular dystrophy (DMD) is a genetic disorder. It is characterized by the progressive weakening of skeletal muscles. This occurs due to a lack of dystrophin, a protein that is crucial for maintaining the integrity of muscle cells.

• Option b: An involuntary muscle contraction is more related to conditions like muscle spasms, not DMD.
• Option c: Potassium deficiency causes issues like muscle weakness (but in a different mechanism than DMD, which is genetic and dystrophin - related).
• Option d: A minor muscle tear that heals quickly is a simple musculoskeletal injury, not a genetic disorder like DMD.

Answer:

A. A progressive weakening of skeletal muscles due to a lack of dystrophin