AFAA Personal Trainer Certification Practice Exam

What does the synovial membrane secrete to help with joint function?

1. Cartilage

2. Synovial fluid

3. Ligaments

4. Bursae

The correct answer is: Synovial fluid

The synovial membrane plays a crucial role in the functionality of joints by secreting synovial fluid. This viscous substance serves several important functions. Firstly, it lubricates the joint, reducing friction between the articular cartilages during movement, which is essential for smoother motion and to minimize wear and tear on the joint surfaces. Secondly, synovial fluid acts as a shock absorber, distributing forces across the joint and protecting bones from impact. Lastly, it provides nutrients to, and helps remove waste from, the cartilage within the joint, as cartilage itself is avascular and does not have its own blood supply. In contrast, cartilage acts as a cushioning structure within the joints but is not secreted by the synovial membrane. Ligaments are connective tissues that attach bone to bone, providing stability, and are also not produced by the synovial membrane. Bursae are small, fluid-filled sacs that provide additional cushioning and reduce friction, but they are not secreted by the synovial membrane nor play a direct role in the secretory process of joint lubrication.