What Would Result from a Lack of Extracellular Ca²⁺ at the Neuromuscular

question 227

Multiple Choice

What would result from a lack of extracellular Ca²⁺ at the neuromuscular junction?

• A) Excessive synaptic vesicles would fuse and release too much ACh, overstimulating the myofiber.
• B) Synaptic vesicles would fail to fuse and ACh would not be released.
• C) Nothing would happen because extracellular Ca²⁺ does not play a role in muscle stimulation.
• D) The neuron must use its intracellular Ca²⁺ to make the vesicles fuse.
• E) Potassium ions are used in place of Ca²⁺ to ensure the vesicles fuse.

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