KINESIOL 1A03 Lecture Notes - Lecture 10: Motor Unit, Motor Neuron, Perimysium

• School: McMaster University
• Department: Kinesiology
• Course: KINESIOL 1A03
• Professor: Krista Howarth

Document Summary

Motor unit: somatic motor neuron and all the muscle fibers it controls, once the somatic motor neuron reaches the perimysium it branches out and goes to multiple fibers. Only one action potential, but it is sent to various muscle fibers: depending on where the motor unit is in the body will determine on how many branches the neuron has. E. g. in the eye, there are much less branches whereas in a larger muscle there are a lot. Contraction types: isometric: length of the muscle does not change, but tension increases, isotonic: tension produced is constant but length of muscle changes i. ) ii. ) Eccentric: muscle lengthens, when resistance is greater than tension.