What characteristic makes synovial joints structurally weaker than other joints in the body?

• A. They are connected by dense fibrous connective tissue.
• B. They lack any movement between the bones.
• C. They have a joint cavity filled with synovial fluid.
• D. They are fused together by cartilage.

Answer: (C)

Verified step by step guidance

1. Understand the structural features of synovial joints: Synovial joints are characterized by the presence of a joint cavity filled with synovial fluid, which allows for a wide range of motion.
2. Compare synovial joints to other types of joints: Other joints, such as fibrous joints, are connected by dense fibrous connective tissue, or cartilaginous joints, which are fused together by cartilage. These structures provide more stability but less mobility.
3. Analyze the relationship between mobility and structural weakness: The joint cavity in synovial joints creates a space between the articulating bones, reducing direct contact and structural reinforcement, which makes them more prone to dislocation or injury compared to other joint types.
4. Consider the role of synovial fluid: Synovial fluid reduces friction and facilitates movement, but the presence of a cavity inherently reduces the structural integrity of the joint compared to joints that are tightly bound by connective tissue or cartilage.
5. Conclude why synovial joints are structurally weaker: The joint cavity filled with synovial fluid is the key characteristic that makes synovial joints structurally weaker, as it prioritizes mobility over stability.