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6 Cards in this Set
- Front
- Back
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In a first-class lever, the applied force and the resistance are on opposite sides of the fulcrum. This lever can change the amount of force transmitted to the resistance and alter the direction and speed of movement. |
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In a second-class lever, the resistance lies between the applied force and the fulcrum. This arrangement magnifies force at the expense of distance and speed; the direction of movement remains unchanged. |
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In a third-class lever, the force is applied between the resistance and the fulcrum. This arrangement increases speed and distance moved but requires a larger applied force. |
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Bony structures that change the direction of applied forces, just as the pulley at the top of a flag pole, are called anatomical pulleys. |
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The lateral malleolus of the fibula acts as an anatomical pulley in the normal functioning of the fibularis longus in the production of plantar flexion at the ankle. |
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The patella acts as an anatomical pulley in the production of extension at the knee by the quadriceps femoris muscles. |
