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Copyright © 2001
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HTML version
Copyright © 2001 |
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a. In the human body when the tendon of a skeletal muscle slides over a round bony surface, the "system" acts like a simple pulley (figure 5-4). A simple pulley provides a change in the direction of the force or muscle pull. There is no change in the amount of force produced by the muscle. For example, the knee acts as a simple pulley by which the quadriceps femoris M. extends the leg.
b. Sesamoid bones, such as the patella (kneecap), develop in tendons where pressure is applied to the tendon. |
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U.S. Navy Ancillary Content and Online Version: David L. Heiserman Publisher: SweetHaven Publishing Services |
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