The nurse is preparing to teach a patient recently diagnosed with myasthenia gravis about the disease. What should the nurse teach the patient that myasthenia gravis is caused by?
A) Genetic dysfunction
B) Upper and lower motor neuron lesions
C) Decreased conduction of impulses in an upper motor neuron lesion
D) A lower motor neuron lesion
Ans: D
Feedback: Myasthenia gravis is characterized by a weakness of muscles, especially in the face and throat, caused by a lower neuron lesion at the myoneural junction. It isn't a genetic disorder. A combined upper and lower neuron lesion generally occurs as a result of spinal injuries. A lesion involving cranial nerves and their axons in the spinal cord would cause decreased conduction of impulses at an upper motor neuron.
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