KNES 300 Lecture Notes - Lecture 18: Structural Level, Electron Microscope, Kinematics
12 Apr 2017
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Dynamic contractile tissue: produces force, performs work on the skeleton, cost: metabolic energy (work-energy theorem, how much work and how much force = main focus. How much force and work: depends on activation (nervous system, depends on kinematics (length, velocity) Sarcomere: the smallest force producing unit of muscle on the structural level: where the actual force a muscle can produce comes from. Thin filament (actin) and thick (myosin) produces the force. When nervous system activates muscle and atp powers the cross bridge cycle. Cross bridge theory: myosin head attaches this shortens the muscle ( contraction , pulls on actin, result: tension/force, powered by atp. Phenomenological model: not an anatomical model doesn"t represent the cross bridges, represents in the input/output of muscles. Contractile component (cc) muscle fibers (active force production in response to neural stimulation) Series elastic component (sec) tendons (external part of tendon that attaches to the skeleton)
