Question

elbow flexion is a ______ class lever.

a) 3rd

b) 1st

c) 4th

d) 2nd

Explanation:

In biomechanics (a subfield of Natural Science, specifically related to human movement and anatomy), elbow flexion involves the biceps brachii muscle acting as the effort, the elbow joint as the fulcrum, and the weight of the forearm and hand as the load. In a third - class lever, the effort is between the fulcrum and the load. For elbow flexion, the fulcrum is the elbow joint, the effort (from the biceps) is applied between the fulcrum and the load (forearm/hand), so it is a 3rd - class lever.

Answer:

a) 3rd