Z331 Fall 2010 Ecampus Week 7 Muscle Lever Systems Posted

Z331 Fall 2010 Ecampus Week 7 Muscle Lever Systems Posted -...

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Week 7: Lecture 2: Chapter 10 –   Muscular Tissue: Lever Systems
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What prevents overstretching during  relaxation? Titin Bone arrangement  Connective tissues 
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Muscle tension = force exerted by a  contracting muscle on an object Load = force exerted by the object Figure 10–18, 307 What affects how much tension  a muscle can generate?
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Amount of Tension of a Single Muscle Fiber  Depends  on: the number of pivoting cross-bridges Number of cross-bridge cycles  determined by: 1. Sarcomere’s length at the  time of stimulation 2. Speed of contraction 3. Frequency of stimulation
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Amount of Tension of a whole muscle  Depends on: the number of pivoting cross-bridges Number of cross-bridge cycles determined by: 1. Muscle (sarcomere) length at the time of  stimulation 2. Speed of contraction 3. Frequency of stimulation 4. Number of motor units recruited 5. Physiological Cross Sectional Area  (PCSA)
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Principles of Muscle  Mechanics cont.:  Tension Production  in individual fibers   The all–or–none  principal: as a whole, a muscle  fiber is either  contracted or  relaxed  You cannot contract  part of a fiber Figure 10-9, 293
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Z331 Fall 2010 Ecampus Week 7 Muscle Lever Systems Posted -...

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