muscle _2

muscle _2 - Chapter 9: Muscle Tissue (contd) What weve...

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Chapter 9: Muscle Tissue (cont’d) What we’ve covered so far: Types of muscle tissue Structure of skeletal muscle Molecular biology of muscular contraction Topics left to cover Dynamics of muscle force generation Isotonic vs Isometric contractions Energy usage during muscular activity Skeletal Muscle Performance Variables Characteristics of Smooth Muscle
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Force Generation (Tension Production) The force exerted by a contracting muscle on an object is called MUSCLE TENSION MUSCLE TENSION The amount of tension (force) produced can vary dramatically 3 Main Factors Affect Muscle Tension Production: Length of fiber/cell at time of stimulation Frequency of stimulation Number & Size of functional units active
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Force Generation (Tension Production) Factors affecting tension produced Length of fiber/cell at time of stimulation
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Force Generation (Tension Production) Factors affecting tension produced Frequency of stimulation TWITCH TWITCH a single cycle of a single cycle of contraction then contraction then relaxation in a muscle cell relaxation in a muscle cell that results from one that results from one stimulus by a nerve cell stimulus by a nerve cell * Contraction / relaxation takes TIME * Contraction / relaxation takes TIME
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Force Generation (Tension Production) Factors affecting tension produced Frequency of stimulation = LOW LOW next stimulation comes after next stimulation comes after muscle cell has had time to relax completely muscle cell has had time to relax completely NEXT NEXT STIMULUS STIMULUS
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Force Generation (Tension Production) Factors affecting tension produced Frequency of stimulation = MEDIUM MEDIUM next stimulation comes next stimulation comes while muscle cell relaxing while muscle cell relaxing NEXT STIMULUS STIMULUS
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Force Generation (Tension Production) Factors affecting tension produced Frequency of stimulation = HIGH HIGH next stimulus comes before next stimulus comes before muscle cell can relax at all muscle cell can relax at all NEXT NEXT STIMULUS STIMULUS
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Force Generation (Tension Production) Factors affecting tension produced Number of muscle fibers active at any given time Number of muscle fibers active at any given time To better understand how this variable affects the tension produced by the whole muscle , we need to examine how the nervous system and muscles are wired together
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Force Generation (Tension Production) A MOTOR UNIT MOTOR UNIT = one nerve cell (called a = one nerve cell (called a motor neuron motor neuron ) ) and the muscle cell(s) it is connected to
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muscle _2 - Chapter 9: Muscle Tissue (contd) What weve...

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