Which type of muscle is involved in flexion activities?

Flexion activities primarily involve the contraction of flexor muscles. Flexors are muscle groups that decrease the angle between two bones at a joint. For instance, when you perform a bicep curl, the muscles in the front of your upper arm (the biceps brachii) are flexors, working to bend your elbow and bring your forearm closer to your upper arm.

In addition to the biceps brachii, other flexor muscles are involved in various actions, including the muscles in the thigh that bend the knee or the muscles in the forearm that flex the wrist. This role is essential in many athletic movements, as activities often require the shortening of muscles to bring about rotation or bending at a joint.

Other types of muscles, such as extensors, adductors, and rotators, serve different functions. Extensors primarily perform the opposite action of flexors by increasing the angle at a joint; adductors bring limbs closer to the body’s midline; and rotators are responsible for turning movements. Thus, flexors are specifically responsible for the action of flexion, making them the correct answer for this question.