Muscular_system

Muscular_system - MUSCULAR SYSTEM(skeletal muscle...

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MUSCULAR SYSTEM (skeletal muscle & connective tissues)
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DEFINITIONS Origin - site of attachment of tendon (usually to a bone) at the stationary end Insertion - site of attachment of tendon (usually to a bone) at the mobile end Belly - fleshy portion of muscle
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Bones act as levers. Joints function as fulcra. Effort is force exerted by muscular contraction. Resistance (load) is weight of the body part being moved.
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Components of a Lever A lever is a rigid object that rotates around a fixed point called a fulcrum Rotation occurs when effort overcomes resistance resistance arm & effort arm are described relative to fulcrum
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First-Class Lever Has fulcrum in the middle between effort & resistance Atlantooccipital joint lies between the muscles on the back of the neck and the weight of the face
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Second-Class Lever Resistance from the muscle tone of the temporalis muscle lies between the jaw joint and the pull of the diagastric muscle on the chin as it opens the mouth
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Has the effort in the middle between the resistance & the fulcrum
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This note was uploaded on 09/24/2011 for the course BSC 1085 taught by Professor Staff during the Summer '09 term at Broward College.

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Muscular_system - MUSCULAR SYSTEM(skeletal muscle...

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