Chapter_11 - Chapter 11 The Muscular System How Skeletal...

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Chapter 11 The Muscular System
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How Skeletal Muscles Produce Movement - The voluntarily controlled muscles of the body make up the muscular system . - The muscular system and muscle tissue contribute to homeostasis by producing movement, stabilizing body position, regulating organ volume, moving substances within the body, and producing heat. - This chapter discusses how skeletal muscles produce movement and describes the principal skeletal muscles.
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How Skeletal Muscles Produce Movement * Skeletal muscles produce movements by exerting force on tendons, which in turn pull on bones or other structures, such as skin. * Most muscles cross at least one joint and are attached to the articulating bones that form the joint.
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How Skeletal Muscles Produce Movement When such a muscle contracts, it draws one articulating bone toward the other. The attachment of the muscle to the stationary bone is its origin. The attachment of the muscle to the movable bone is its insertion . Fleshy portion of the muscle in between attachment sites = belly
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How Skeletal Muscles Produce Movement * Muscles that move a body part often do not cover the moving part; eg. the biceps brachii lies over the humerus, but moves the forearm. * Tenosynovitis is an inflammation of the tendons, tendon sheaths, and synovial membranes surrounding certain joints.
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Produce Movement * A lever is a rigid structure that moves around a fixed point, the fulcrum (F) * The lever is acted on
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This note was uploaded on 04/09/2008 for the course BIOL 141L taught by Professor Townsend during the Spring '06 term at Scranton.

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Chapter_11 - Chapter 11 The Muscular System How Skeletal...

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