Kinesiology 3341A/B Lecture Notes - Lecture 12: Physiological Cross-Sectional Area, Biceps, Triceps Brachii Muscle
17 Jan 2017
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Actin and myosin interact within a cross-bridge. Fibres only generate tension try to get shorter: e. g. flexors will tend to cause elbox to flex flexor moment, exert more force than external shorten. Neuron travels out, splits into terminal endings and innervates individual muscle fibres. Colours indiciate that fibres from unit are spread out across muscle. Amount of force muscle generates is prooirttiant to its cross-sectiona larea. Pennate: figher force production but smaller range of motion. Fusidorm: lower force but greater range of motion: parallel muscle force, muscles are long and result in a lot of shortening. Bicep curl in the horizontal plane, gravity is not working against. To elbox ectend, need to turn biceps off or down, whether to turn on triceps depends on gravity. Amount of force is how many cross-bridges can form. Shorten further overlap occurs, bonds between actin and myopsin is reduced, force is then reduced. Sheath around muscle tendonous sheath in parrallle lto muscle fibres.
