Question

which of the following are examples of a 1st class lever? elbow flexion elbow extension cervical flexion cervical extension

Explanation:

In a first - class lever, the fulcrum is between the effort and the load. Cervical extension is an example of a first - class lever in the human body where the atlanto - occipital joint (fulcrum) is between the neck extensor muscles (effort) and the weight of the head (load). Elbow flexion and extension are third - class levers, and cervical flexion is not a first - class lever.

Answer:

Cervical Extension