Which muscles are used to flex the knee joint?
a. hamstrings, gastrocnemius, and soleus
b. hamstrings, gracilis, and sartorius
c. rectus femoris, vastus lateralis, and vastus medialis
d. biceps femoris, vastus lateralis, and stratorius
Answer: B
The American College of Sports Medicine, ACSM, multiple choice questions with their answers.