American Academy of Professional Coders (AAPC) Practice Exam

What characteristic does articular cartilage provide in joints?

1. Covering the surface of bones

2. Acting as a lubricant

3. Stabilizing the joint

4. Transmitting signals to the brain

The correct answer is: Covering the surface of bones

Articular cartilage is a specialized type of cartilage that plays a crucial role in joint function by covering the surfaces of bones where they meet to form a joint. This smooth, shiny tissue reduces friction between the bones during movement, enabling the joints to move freely and efficiently. The properties of articular cartilage allow it to withstand the mechanical stress and pressure commonly experienced in the joints, which is vital for maintaining joint health and mobility. The other options describe functions that are not primarily associated with articular cartilage. While joints do require lubrication, this is mainly provided by synovial fluid, not the cartilage itself. Stabilization of the joint comes from the ligaments, capsules, and other supportive structures, rather than from the cartilage. Lastly, transmitting signals to the brain pertains to sensory nerve endings, which are not the function of articular cartilage. Therefore, the primary characteristic of articular cartilage is its role in covering the surfaces of bones to facilitate smooth joint movement.