Motor Unit

Question 1

1. Nerve impulse initiated…

Answer 1

…in the motor neuron cell body.

Question 2

2. Nerve impulse conducted…

Answer 2

…down the axon of the motor nerve by action potential to the synaptic cleft.

Question 3

3. Neurotransmitter called…

Answer 3

…acetylcholine is secreted to conduct the nerve impulse across the gap.

Question 4

4. If electrical charge is above the threshold…

Answer 4

…all muscle fibres will contract.

Question 5

5. If electrical charge is below the threshold…

Answer 5

…none of the muscle fibres will contract.