KPE160H1 Lecture Notes - Lecture 7: Myocyte, Neuromuscular Junction, Motor Neuron
9 Mar 2019
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Document Summary
Muscle-tendon units: organs that join the articulated segments of our body, tendons are passive elastic ropes, muscles are active capable of generating pulling forces (tension, control posture and movement. Kpe160: myosin is brown thing in middle, like row boat in water oars pull the boat along. In bottom left, oar pulls the boat along. Factors affecting force production**: amount of force produced by muscle determined by, activation, architecture, anatomic cross-sectional area, length, velocity. Force-activation relationship: more activation generates more force, very complicated not well understood, for isometric activity ~ linear emg vs force, 3x as much activation = 3x as much force, etc, for non-isometric activity, non-linear emg vs force. Normalized force vs length: l0 = resting length; f0 = isometric force at l0, active force gone when muscle is long (around 1. 6x regular length) passive increases, muscles are strongest at mid-length. Open and closed kinetic chains: our extremities are kinetic chains.
