Kinesiology 4430F/G Lecture Notes - Lecture 3: Myocyte, Motor Unit, Motor Neuron
15 Jun 2016
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Document Summary
All muscle fibres from one unit are of the same type. All fibres of one mu are activated usually together. It is really difficult to change muscle fibre type in the body because you fundamentally have to change the entire motor neuron which is less adaptable than the muscle fibres. The red motoneuron in the diagram controls the dark muscle fibres in the muscle below it: sends the train of action potentials and all the. 10 fibres that the motoneuron controls will be activated. The motor unit: the motoneuron and all muscle fibres it innervates, smallest or fundamental functional unit of contraction (i. e. , controlled by the cns) vs. Sarcomere: many muscle fibres innervated by each motoneuron, but each fibre is innervated by only 1 motoneuron. Muscle tension is proportional to size of. Mu; fine control is inversely proportional to size. You get bigger motor units with aging because you get less muscle fibres.
