100_Muscles_Chap_6_Sum_10_

100_Muscles_Chap_6_Sum_10_ - Chap 6 The Muscle System...

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Chap 6 The Muscle System Wimbledon Champions 2010
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•Consists of tightly packed cells (muscle fibers) pecialized to shorten or contract •Specialized to shorten or contract •Results in movement •Generally long and thin and parallel to one another
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Characteristics of Muscles All muscles are excitable, contractile, extensible, and elastic Excitable : respond to stimuli ontractile shorten Contractile : shorten Extensible : stretch Elastic : return to their original length after being shortened or stretched
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Skeletal Muscle Tissues • Skeletal ( voluntary ) muscle • Connects to tendons, which attach to bones
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Two More Muscle Types •Cardiac Muscle •Found only in the heart •Responsible for rhythmic contraction •Pump blood throughout the body •Smooth Muscle •Surrounds hollow organs and tubes •Blood vessels, digestive tract, uterus and bladder
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The Muscular System
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Muscle Function: Produce Movement or Generate Tension Principle function Contraction: shorten distance between bones eletal muscle moves bone Skeletal muscle moves bone Muscle groups Syn ergistic: groups work together Ant agonistic: groups oppose each other
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Skeletal Muscles Work in Pairs The biceps contracts and pulls the forearm up, flexing the arm. Origin of muscle: attachment of muscle to less moveable bone Figure 6.1a (a) Flexion The relaxed triceps is stretched. Insertion of muscle: attachment of muscle to more moveable bone
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Skeletal Muscles Work in Pairs The triceps contracts and pulls the forearm down, extending the arm. Figure 6.1b (b) Extension The relaxed biceps is stretched.
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Skeletal Muscles Work in Pairs Each muscle is attached to a bone by a tendon (a band of connective tissue) The origin of the muscle is attached to the bone that remains stationary during movement The insertion is attached to the bone that moves Bones act as levers in working with skeletal muscles to produce movement
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Muscle Structure Striated Skeletal Muscle (having distinct bands)
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100_Muscles_Chap_6_Sum_10_ - Chap 6 The Muscle System...

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