What are the two main types of connective tissues that form the skeletal system?

• A. Tendon and Ligament
• B. Bone and Cartilage
• C. Blood and Bone Marrow
• D. Muscle and Nerve

Answer: (B)

The skeleton is built primarily from two connective tissues: bone and cartilage. Bone provides the rigid framework that supports and protects the body, stores minerals, and houses marrow for blood cell production. Cartilage offers flexible, smooth surfaces at joints and serves as a template during growth and development. Both tissues arise from mesenchymal cells and contain specialized cells—osteocytes in bone and chondrocytes in cartilage—within distinct extracellular matrices that give each tissue its unique properties. Cartilage is avascular and heals slowly, while bone is richly vascularized, supporting rapid repair and metabolic needs. Other tissues like tendons and ligaments, blood and bone marrow, or muscle and nerve don’t form the skeletal framework itself, even though they’re involved in the musculoskeletal system.