Concept explainers
To identify: The lever system of the given image.
Introduction: The muscular system consists of skeletal, smooth, and cardiac muscles. This system contributes more to the body weight than other organ system of the human body. It allows the body movement, maintains posture, and helps in blood circulation throughout the body.
Answer to Problem 1CRQ
Pictorial representation: Fig.1 represents the second-class lever system.
Fig.1: Second-class lever system
Explanation of Solution
In the given image, the fulcrum is present at the front, the load at the middle region, and the applied force at last. Hence, it is identified as second-class lever system. In this class of lever, the resistance is in the middle position of the lever placed in between the fulcrum and applied force or effort. The depressions of the feet to stand on the tip toe. The superior pull by the calcaneal tendon attached to the heel causes a contraction of calf muscles.
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