Studies in Advanced Physiology

Cover Studies in Advanced Physiology
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Such arrangements in our bodies indicate that the levers were intended rather for dexterity and rapidity of motion than for the ability to lift mere weights. However, in the case of the ankle, at which point we have to lift at each step the weight of the entire body, a lever of the second class is put, an arrangement by which a person is never obliged to pull as much on his muscles as the weight of his body actually is.
THE MATHEMATICS OF LEVEES.
In every lever, no matter whether of the first,
...second or third class, the distance from the power to the fulcrum is called the "power-arm" (pa), while the distance from the "weight" to the fulcrum is called the "weight-arm" (wa) . In all three classes of levers the following simple arithmeti- cal proportion holds true: That the P: W: \wa:pa. Hence, if three of these factors are given, by the simplest mathemat- ical process the fourth may be determined. To illustrate in a specific case : If we assume in the case of the foot the dis- tance from the toes to the astragalus to be seven inches, and the distance from this point in the astragalus to the point where the tendon is attached to the heel bone two inches, we have the power-arm of seven inches plus two inches, or nine inches, and the weight-arm seven inches.

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