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A 35-year-old woman having an anxiety attack collapses. The emergency medical technician(EMT)who arrives on the scene notes that she is hyperventilating and suspects that she is suffering from tetany, a continuous contraction of skeletal muscle fibers caused by an increase in the excitability of nerves and muscle membranes. T he increased membrane excitability is caused by which of the following?
A.
Decreased release of inhibitory neurotransmitter from nerve terminals
B.
Depolarization of the nerve and muscle membranes
C.
Spontaneous release of calcium from the sarcoplasmic reticulum(SR)
D.
Activation of sodium channels at more negative membrane potentials
E.
Increased magnitude of the action potentials invading nerve terminals