Indicate the example of a first-class lever.Multiple choice question.Contraction of posterior neck muscles to look upwardMovement of temporomandibular joint when opening mouthContraction of biceps brachii flexing the elbow
Question
Indicate the example of a first-class lever.Multiple choice question.Contraction of posterior neck muscles to look upwardMovement of temporomandibular joint when opening mouthContraction of biceps brachii flexing the elbow
Solution
The example of a first-class lever is the contraction of posterior neck muscles to look upward.
Here's why: In a first-class lever, the fulcrum (or pivot point) is located between the effort and the load. When you look upward, the fulcrum is the joint between the neck and the skull, the effort is provided by the contraction of the posterior neck muscles, and the load is the weight of the head. Therefore, this action represents a first-class lever.
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