BIO203_Muscle_FibType_Spindle

BIO203_Muscle_FibType_Spindle - Muscle proprioceptors •...

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1 Muscle Fiber Types Classification based on: • speed of contraction • time to fatigue • metabolic patterns of energy provision Metabolic relationships to fiber type Environmental/ecological relationships to fiber type Sherwood, Klandorf & Yancey, Animal Physiology: From Genes to Organisms , Table 8-3 Skeletal Muscle Metabolism: Energy Sources Sources of energy for muscle contraction: • ATP pool in cell • creatine phosphate pool in cell • “stored energy” reserve in cell • glycogen •fa t • “stored energy” reserves elsewhere increasing availability Animal Physiology: From Genes to Organisms ,
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2 Eckert Animal Physiology , Fig. 10-29 Eckert Animal Physiology , Fig. 10-30 Histochemical Staining of Muscle for Myosin ATPase Control of Motor Movement Positional information: sensory information via afferent neurons from proprioceptors in various parts of the body
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Unformatted text preview: Muscle proprioceptors: • muscle spindles sense muscle length • Golgi tendon organs sense muscle tension Control of muscle activity: • reflexive • command Sherwood, Klandorf & Yancey, Animal Physiology: From Genes to Organisms , Figure 8-24 3 Muscle spindle components: • spindle cells = modified, specialized muscle fibers (intrafusal) • gamma ( γ ) motor neuron = motor (efferent) nerve from spinal cord to muscle spindle cells • afferent sensory nerves = sensory (afferent) nerves from muscle spindle cells to spinal cord Skeletal muscle components: • muscle fibers (extrafusal) • alpha ( α ) motor neurons Sherwood, Klandorf & Yancey, Animal Physiology: From Genes to Organisms , Figure 8-25 Muscle Spindle Structure Sherwood, Klandorf & Yancey, Animal Physiology: From Genes to Organisms , Figure 8-26a...
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BIO203_Muscle_FibType_Spindle - Muscle proprioceptors •...

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