Made up of motor neuron + muscle fibre it stimulates
Carries nerve impulses from brain + spinal cord to muscle fibres
1. Nerve impulse initiated by brain to contract rectus femoris
2. Nerve impulse travels down spinal cord into motor neuron
3. Nerve impulse travels down motor neuron into axon by action potential
4. When impuse reaches synaptic cleft, a neurotransmitter called Ach released
5. if action potential big enough + sufficient Ach, the impulse will travel across synapse + rectus femoris will contract
Uses all or none principle as all muscle fibres will give complete contraction or no contraction at all
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