Which one of the following statements concerning muscle diseases is incorrect? a

Question

Which one of the following statements concerning muscle diseases is incorrect?

a. Muscle contractile activity occurring independent of normal voluntary excitation-contraction coupling is termed a contracture.

b. Heritable human diseases typically have great genetic diversity (many causative mutations), while heritable animal mutations have far less genetic diversity due to a single common founder.

c. Charcot Marie Tooth disease is a group of related genetic disorders caused by progressive demyelination of peripheral nerves and disturbances in nerve conduction.

d. Myasthenia gravis results from an immune-mediated loss of functional acetylcholine receptors at the neuromuscular junction that in turn impairs activation of muscle contraction.

e. Mutations in the RYR2 gene have been found to be associated with diseases affecting cardiac muscle contractility.

Explanation / Answer

the answer is E , because Mutations in the RYR2 gene are associated with catecholaminergic polymorphic ventricular tachycardia, stress-induced polymorphic ventricular tachycardia, and arrhythmogenic right ventricular dysplasia

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