Which type of lever is exemplified by the flexing of the forearm by the biceps brachii muscle?
A) a first-class lever
B) a second-class lever
C) a third-class lever
D) a fourth-class lever

Question

Quizplus · Accepted Answer

The biceps brachii muscle acts as a third-class lever because the effort (muscle) is applied between the fulcrum (elbow joint) and the resistance (weight of the forearm and hand). This type of lever is characterized by a relatively small effort force being applied over a large distance to move a heavier resistance force over a smaller distance.

Which Type of Lever Is Exemplified by the Flexing of the Forearm