The joint between the occipital bone of the skull and the first cervical vertebra (atlas)is which part of which class of lever system?
A)first-class lever; load
B)second-class lever; applied force
C)third-class lever; load
D)first-class lever; fulcrum
E)third-class lever; fulcrum

Question

Quizplus · Accepted Answer

The joint between the occipital bone of the skull and the first cervical vertebra (atlas) is a first-class lever system, with the fulcrum located between the load and the applied force. The fulcrum is the joint itself, the load is the weight of the head, and the applied force is the contraction of the cervical extensor muscles that hold the head upright.

The Joint Between the Occipital Bone of the Skull and the First