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206 bones in adult human body. Skull: 22 bones, protects brain. Spine (vertebral column): 33 vertebrae, S-shaped, supports body and protects spinal cord. Rib cage: 12 pairs of ribs + sternum, protects heart and lungs. Cartilage: soft, flexible โ at ear, nose, knee joints. Functions: support, protection, movement, blood cell production.