Muscular System - TheMuscularSystem Threetypesofmuscle...

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The Muscular System Three types of muscle • Skeletal muscle­ attaches to and moves bone – is striated – is voluntary • Smooth muscle­ located in the walls of internal structures – non­striated – Involuntary • Cardiac muscle
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Functions of Muscle Tissue • Motion • Movement of substances within the body • Stabilizing body position and regulating organ volume – maintaining posture – maintaining food storage in stomach • Heat production – muscle contraction generates 85% of the body’s heat
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Characteristics of Muscle Tissue • Excitability­ receive and respond to stimuli • Contractility­ ability to shorten and thicken • Extensibility­ ability to stretch • Elasticity­ ability to return to its original shape after contraction or extension
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General Anatomy of Skeletal Muscle origin ­ stationary end of muscle attachement insertion ­ mobile end of attachment belly ­ thicker middle region
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Structure of Skeletal Muscle Connective tissue components • fascia­ sheets or bands of fibrous c.t. around organs, muscle and beneath the skin superficial fascia (subcutaneous layer)­ composed of areolar c.t. and adiose tissue and is located under the skin deep fascia­ composed of dense, irregular c.t. that holds muscles together and from which the various subdivisions of muscle c.t. are derived
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In hand and eye there are fewer than 100 fibers per motor unit; in lower leg there are 1000 fibers per motor unit
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Muscular System - TheMuscularSystem Threetypesofmuscle...

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