Which of the following are examples of muscles that are antagonistic, having opposite functions? (Select all that apply.)
a. Sartorius–quadriceps
b. Biceps–triceps
c. Quadriceps femoris–hamstrings
d. Pectoralis major–latissimus dorsi
e. Tibialis anterior–gastrocnemius
f. Adductor magnus–latissimus dorsi
ANS: B, C, D, E
A. The sartorius is a synergist to the quadriceps group for flexion of the thigh. F. The adductor magnus and gracilis muscles are antagonists to the vastus lateralis.
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