What is the primary function of the quadriceps muscle?

The primary function of the quadriceps muscle is to extend the knee. The quadriceps is a group of four powerful muscles located at the front of the thigh, which primarily work to straighten the leg at the knee joint during movements such as walking, running, and jumping. This action is crucial for activities involving any extension of the leg, making the quadriceps essential for maintaining mobility and stability in the lower body.

In addition to knee extension, the quadriceps can also play a secondary role in stabilizing the knee during activities that involve balance and control, as well as assisting in hip flexion due to the rectus femoris, one of the four muscles making up the quadriceps. However, its primary and most acknowledged role remains the extension of the knee joint.