BIO210Y5 Chapter Notes - Chapter 10: Biceps, Orbicularis Oris Muscle, Umbar

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18 Feb 2016
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10. 2 muscular power and range of motion are influenced by fascicle organization. The force, speed, or direction of movement produced by muscle contraction can be modified by attaching the muscle to a lever. In the body, each bone is a lever and each joint is a fulcrum, and muscles provide the applied force. In a first-class lever, the fulcrum (f) lies between the applied force (af) and the load (l). First-class levers are like seesaws the balance depends on the relative sizes of the force and the load, and how far each is from the fulcrum. In a second-class lever, the load is located between the applied force and the fulcrum. Because the force is always farther from the fulcrum than the load is, a small force can move a larger weight, but the load moves more slowly and covers a shorter distance. Thus the effective force is increased at the expense of speed and distance travelled.

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