PHYSIOLOGY
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Contracting the gastrocnemius muscles to elevate the body on the toes involves a ____ lever.
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first-class
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second-class
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third-class
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fourth-class
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Explanation:
Detailed explanation-1: -Answer and Explanation: Contracting the gastrocnemius to elevate the body on the toes is one of the few examples of a second-class lever in the body.
Detailed explanation-2: -Figure 2.2 First-class lever: toe raise. Figure 2.3 Second-class lever: push-up.
Detailed explanation-3: -Standing on tip toes is a Class 2 lever. The pivot is at your toe joints and your foot acts as a lever arm. Your calf muscles and achilles tendon provide the effort when the calf muscle contracts. The load is your body weight and is lifted by the effort (muscle contraction).
There is 1 question to complete.