34. Botulinus Aceylcholine fromuses paralysis. It binds to the motor neuron and

Question

34. Botulinus Aceylcholine fromuses paralysis. It binds to the motor neuron and reduces the release of A. Compared to a motor cetcholinuses paralysis. It synaptic end plate potential in (6 Points) neuron-skeletal muscle synapse in the absence of the toxin, the post- ine from the motor neuron axon terminal. the would be (Circle correct answer) DEPOLARIZEDHYPERPOLARIZED e motor neuron)wocthe presence of the toxin (and after an action potential occurred in NO CHANGE Explain your selection-be brief but thorough. Do not physiological explanation. just repeat the answer-provide a Assuming enough acetylcholine was released to elicit an action potential in the post-synaptic cell. compared to a motor neuron-skeletal muscle synapse in the absence of the toxin, the postysynpatic action potential amplitude in the presence of the toxin would be (Circle correct answer) GREATER THAN LESS THAN THE SAME AS Explain your selection -be brief but thorough. Do not just repeat the answer-provide a physiological explanation.

Explanation / Answer

a. Hyperpolarized.

In the absence of acetylcholine neurotransmitter, there would be no depolarization of the post-synaptic neuron. Hence, the neuron would become increasingly polarized and would be hyperpolarized.

b. Greater than normal.

Successful stimulation would require a lot of stimulation and loads of acetylcholine release. This will act more intensely on the post-synaptic neuron and hence, the response would be greater than normal.

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