AFAA Personal Trainer Certification Practice Exam

What type of joints allow for a larger range of motion due to a small space between the articulating bones?

1. Fibrous joints

2. Cartilaginous joints

3. Synovial joints

4. Bony joints

The correct answer is: Synovial joints

Synovial joints are characterized by the presence of a joint cavity filled with synovial fluid, which provides lubrication and reduces friction between the articulating bones. This category of joints is designed to facilitate a wide range of motion, supporting movements such as flexion, extension, rotation, and gliding. The small space between the articulating bones within synovial joints allows for greater mobility compared to other types of joints, which may restrict movement due to their structural characteristics. Fibrous joints, for instance, are connected by dense connective tissue and typically allow for little to no movement. Similarly, cartilaginous joints are connected by cartilage and permit limited movement, as they are more stable and less mobile than synovial joints. Bony joints, formed when two bones fuse together, completely restrict movement. Thus, synovial joints are the only type that provides the larger range of motion while maintaining a small space between the bones, making them essential for dynamic activities in the body.