A) Muscles in the back of the lower leg are contracting but that in the front are relaxing.
B) Muscles in the front of the lower leg are contracting but that in the back are relaxing.
C) Muscles in the back of the thigh are contracting but that in the front are relaxing.
D) Muscles in the front of the thigh are contracting but that in the back are relaxing.
Correct Answer: D
Solution :
[d] When any muscle contracts, its antagonist relaxes by rule. The leg swings forward because the muscles in the front of the thigh (quadriceps femoris) contract. At the same time the hamstrings in the back of the thigh, relax and are lengthenedYou need to login to perform this action.
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