Bones, ligaments and muscles are structures that are considered to be lever system in the body for human movement. Classically, the levers are represented as : first, second and third (I,II and III), classes of levers depending on their relative positions of the fulcrum, effort and resistance (or load).
Given below are few body part movements (represented as P = backward bending of neck, Q = walking on toe and R = folding of arm) which can be compared to specific classes of levers. From the options belows identify the correct combination of body part to that of a class of lever.
(a) P-I, Q-II, R-III
(b) P-II, Q-III, R-I
(c) P-III, Q-I, R-II
(d) P-II, Q-I, R-III
