Botulinus Toxin Causes Paralysis by Preventing the Exocytotic Release of Acetylcholine

question 16

Multiple Choice

Botulinus toxin causes paralysis by preventing the exocytotic release of acetylcholine from the synaptic vesicles.Which of the following events would still occur in a tissue treated with this toxin?

• A)Calcium ion channels in the pre-synaptic membrane open allowing Ca⁺⁺ to enter the neuron.
• B)Acetylcholine is released into the pre-synaptic cleft.
• C)A post-synaptic action potential is generated in the muscle fiber.
• D)Sodium ion channels in the post-synaptic membrane open.
• E)The muscle fiber contracts.

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