What is the function of a bursa?

The primary function of a bursa is to reduce friction between moving structures, particularly in areas where muscles, tendons, and bones interact, such as joints. Bursae are small, fluid-filled sacs that help lessen the impact of friction as these structures move against one another during movement. By providing a cushion-like space, they allow for smoother motion and decrease wear and tear on the tissues involved.

In contrast, while supporting and stabilizing joints is crucial, this is primarily a function of ligaments and tendons, not bursae. Storing fat for energy is a role associated with adipose tissue, and producing blood cells is a function of bone marrow, neither of which are related to the role of bursae.