Lecture 10.docx - Biomechanics of Human Skeletal Muscle...

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Biomechanics of Human Skeletal Muscle Behavioral Properties of the Musculotendinous Unit 1) extensibility: ability to be stretched or to increase in length o as you go through a range of motion some muscles will get shorter and some will get longer o have ability to increase in length 2) elasticity: ability to return to normal resting length following a stretch o 2 basic elastic components parallel elastic component elastic structures within the muscle structures that do not pass through the contractile component o contractile component (thing that makes force in muscle) create cross bridges and once formed it creates change in shape of the protein and that causes pulling action to cause force o many aspects that affect that force physically elastic structures that surround that contractile components o they are not directly affected by cross bridge formation o only by the length of the muscle series elastic component elastic structures that are in line with the contractile component o the cross-bridge formation between actin and myosin there are elastic structures in that protein itself and hold that protein in place o they are only stretched when in series (in line) with the contractile component o only stretched when cross bridge is formed both create a lot of the force length and force velocity curves Behavioral Properties of the Musculotendinous Unit 3) irritability: ability to respond to a stimulus o brain can say turn on or not 4) ability to develop tension: the contractile component of muscle function o cross bridges being created between actin and myosin which causes rotation of the protein and tries to pull Structural Organization of Skeletal Muscle Human body has approx. 434 muscles o 40-45% of total body weight in adults o
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  • Fall '13
  • MOORE
  • Structural Organization of Skeletal Muscle

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