Indicate the example of a third class lever.Multiple choice question.Movement of temporomandibular joint when opening mouthContraction of posterior neck muscles to look upwardContraction of biceps brachii flexing the elbow
Question
Indicate the example of a third class lever.Multiple choice question.Movement of temporomandibular joint when opening mouthContraction of posterior neck muscles to look upwardContraction of biceps brachii flexing the elbow
Solution
The example of a third class lever is the contraction of the biceps brachii flexing the elbow.
Here's why:
In a third class lever, the effort is between the load and the fulcrum. When the biceps brachii contracts, it acts as the effort, the elbow joint is the fulcrum, and the forearm (along with any weight it might be lifting) is the load. The effort from the muscle contraction is applied to the forearm (the load) through the lever system of the elbow joint (the fulcrum).
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