A Muscle That Flexes the Trunk is the _______

Question

A muscle that flexes the trunk is the _______.
A) external oblique
B) quadriceps femoris
C) rectus abdominis
D) gastrocnemius

Accepted Answer

The rectus abdominis is a muscle that runs vertically down the abdomen and is responsible for flexing the trunk. The external oblique also helps with trunk flexion, but is not the best choice as it is primarily responsible for rotation of the trunk. The quadriceps femoris and gastrocnemius are both leg muscles and do not contribute to trunk flexion.