Which of the Following Muscles Would Be Considered an Antagonist

Question

Which of the following muscles would be considered an antagonist to the rectus femoris?
A) Sartorius
B) Biceps femoris
C) Vastus intermedius
D) Gracilis
E) Vastus lateralis

Accepted Answer

The biceps femoris is an antagonist to the rectus femoris because while the rectus femoris is a primary muscle involved in knee extension and hip flexion, the biceps femoris is part of the hamstrings group that primarily facilitates knee flexion and hip extension, thus opposing the actions of the rectus femoris.