What is the function of a bursa in the body?

The function of a bursa in the body is to protect bones and reduce friction during movement. Bursae are small, fluid-filled sacs located around joints, particularly where tendons and ligaments slide over bones. They act as cushions, enabling smooth motion and minimizing wear and tear on tissues during activities such as walking, running, and bending. This protective role is crucial for preventing inflammation and injury that can arise from repetitive movements or pressure on the joints.

The other options relate to different bodily functions. Storing fat is associated with adipose tissue, which serves as energy reserves. The production of red blood cells primarily occurs in bone marrow, while supporting muscle contraction involves structures like muscles and tendons, as well as how they interact with nerves. These functions do not capture the specific role of the bursa, which is centered on reducing friction and providing cushioning in the joint spaces.