What is the microscopic structure of cartilage and bone?

Cartilage is composed of a dense extracellular matrix rich in collagen fibers and proteoglycans, with chondrocytes (cartilage cells) residing in lacunae scattered throughout. This structure provides flexibility and support while allowing for the smooth movement of joints. In contrast, bone has a highly organized matrix that includes collagen fibers and mineral deposits, primarily hydroxyapatite, which give it strength and rigidity. Bone cells, including osteocytes, osteoblasts, and osteoclasts, are embedded in the matrix and play crucial roles in bone maintenance and remodeling.