General
- The site where the nerve ending comes into intimate contact with the muscle fibre
- Axon terminals are lodged in grooves in the sarcolemma covering the sole plate
- Acetylcholine is released
Facts about muscle action
- All or none law: When a stimulus above the threshold strength is applied, the muscle (and the motor unit, innervated by a single axon) contracts to its full extent.
- Fatigue: Depletion of neurotransmitter causes failure of muscle to contract.
- Muscle tone: Some fibres, in a resting muscle, are always in a state of contraction.
- Endurance: The capacity of a muscle to maintain activity over a period of time.
- Trophic effect: Nerve supply maintains the integrity of the muscle
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