Question

elbow extension is an example of which class lever?
a) 1st
b) 2nd
c) 3rd
d) 4th

Explanation:

Lever classes are categorized based on the position of the effort, fulcrum, and load. In elbow extension, the effort (muscle contraction) is applied between the fulcrum (elbow joint) and the load (weight of the forearm and hand). This matches the characteristics of a 3rd - class lever.

Answer:

c) 3rd