A 34-year-old woman
presents with complaints of progressive weakness. She says that her symptoms get
worse toward the end of the day, she has difficulty swallowing and smiling, and
she sometimes gets double vision. She is diagnosed with myasthenia gravis, an
autoimmune disorder in which muscle cells cannot respond appropriately to
neural stimulation. Autoantibodies bind to and destroy acetylcholine receptors
on the postsynaptic membrane of the muscle fiber. What does this disease in
muscle fibers lead to?

Question

Accepted Answer

reduced release of
calcium cations into the sarcoplasm

Answer

increased release of
calcium cations into the sarcoplasm

Answer

increased binding of
calcium cations to troponin C

Answer

reduced binding of
calcium cations to calmodulin

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A 34-year-old woman presents with complaints of progressive weakness. She says t...

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