please answer the 3 questions I attached in details

please answer the 3 questions I attached in details


1.
Can a threshold stimulus reaching the axon hillock during an ongoing action
potential produce another action potential? Explain based on the property of
ion channels involved.
2.
What could be the consequence of blocking all voltage-gated calcium
channels on a neuron.
3.
Explain the role of motor units in determining strength versus fine control of
responses of various muscles.

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