Question

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where is the class 1 lever system located in the body?
neck and spine
shoulder and hip
elbow and knee
chest and abdomen
wrist and ankle

Explanation:

In the human body, a class - 1 lever system is present in the neck and spine. Here, the fulcrum is the joint between the skull and the first cervical vertebra (atlas - axis joint). The weight (resistance) is the head, and the effort is provided by the muscles at the back of the neck.

Answer:

Neck and spine