Chapter 10 Muscle Tissue

Chapter 10 Muscle Tissue - 8/16/2010 1 2 3 4 5 6 7 8 9 10...

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8/16/2010 1 Muscular Tissue Chapter 10 Overview Muscle is the only contractile tissue > 600 skeletal muscles ~50% of body weight Functions – movement, maintenance of posture, joint stabilization, and heat generation Special features Contractility – able to shorten Excitability (irritability) – sensitive to nerve impulses Extensibility – when relaxed, muscles can stretch Elasticity – after stretching, return to regular length Types of muscle tissue Basic features of skeletal muscle Basic features of skeletal muscle: nerves Motor Unit A single motor neuron and the muscle fibers that it innervates – maximum contraction # of muscle fibers per motor unit varies – 1:10 => eye http://cim.ucdavis.edu/Eyes/Version1/eyesim.htm – 1:500 => quadriceps Basic features of skeletal muscle Muscle Fibers and Contraction Muscle organization Muscle Fibers and sarcomeres Myofibrils – thin (actin) – thick (myosin) * striations Sarcomere
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This note was uploaded on 08/05/2011 for the course APK 2100 taught by Professor Dr.tillman during the Summer '07 term at University of Florida.

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Chapter 10 Muscle Tissue - 8/16/2010 1 2 3 4 5 6 7 8 9 10...

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