motor unit

Question 1

What is a motor unit?

Answer 1

Made of one motor neuron and multiple muscle fibres

Question 2

Describe the process of stimulation of motor unit

Answer 2

1. Nerve impulse initiated in the motor neuson cell
2. Nerve impulse conducted down the axon of the motor neuron by a action potential
3. Neurotransmitter is secreted into the synaptic cleft to conduct the nerve impulse across the gap
4. If the elctrical charge is above a threshold, the muscle fibre will contract
5. ‘All or none’ law