Motor Units & Spatial Summation

Motor Units & Spatial Summation:

Motor Unit - A motor neurone & its muscle fibres

All the motor neurones leading to skeletal muscles have branches each which leads to a junction with a single msucle fibre - Neuromuscular junction

Nerve impulses pass down a singular motor neurone & cause a contraction in all the muscle fibres.

All or nothing law - muscle fibres either contract (maximally) or do not contract; there is no such thing as a partial contraction

All firbres with a motor unit are the same type either fats or…