MUSCLE
SKELETAL MUSCLE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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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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Detailed explanation-1: -Contracting the gastrocnemius to elevate the body on the toes is one of the few examples of a second-class lever in the body. The ball of the foot acts as the axis (A), body mass acts as the resistance (R) at the talocrural joint (ankle), and the gastrocnemius muscle applies force (F) to the calcaneus.
Detailed explanation-2: -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).
Detailed explanation-3: -Action of the gastrocnemius pulls the heel up and thus extends the foot downward; the muscle provides the propelling force in running and jumping.