What is Myasthenia Gravis?

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Study for the Anatomy and Physiology Muscular System Test. Prepare with flashcards and multiple choice questions; each question provides hints and explanations. Get ready to excel in your exam!

Multiple Choice

What is Myasthenia Gravis?

Explanation:
Myasthenia Gravis is an autoimmune disease of the neuromuscular junction where antibodies reduce the number of functional acetylcholine receptors on the muscle side. With fewer receptors available, the signal from the nerve is less able to trigger a normal muscle contraction, especially after repeated use, so weakness is fatigable and tends to worsen with activity and improve with rest. The correct choice reflects this mechanism: progressive weakness caused by a shortage of acetylcholine receptors at the neuromuscular junction. The other descriptions describe muscle enlargement, joint twisting, or stretching a muscle, which are not hallmarks of MG.

Myasthenia Gravis is an autoimmune disease of the neuromuscular junction where antibodies reduce the number of functional acetylcholine receptors on the muscle side. With fewer receptors available, the signal from the nerve is less able to trigger a normal muscle contraction, especially after repeated use, so weakness is fatigable and tends to worsen with activity and improve with rest. The correct choice reflects this mechanism: progressive weakness caused by a shortage of acetylcholine receptors at the neuromuscular junction. The other descriptions describe muscle enlargement, joint twisting, or stretching a muscle, which are not hallmarks of MG.

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