• Bones consist of different types of tissue, including compact bone, spongy bone, bone marrow, and periosteum.
  • The basic structure of bones is bone matrix, which makes up the underlying rigid framework of bones.
  • The bone matrix consists of tough protein fibers, mainly collagen, that become hard and rigid due to mineralization with calcium crystals.
  • Bone matrix is crisscrossed by blood vessels and nerves and contains specialized bone cells that are actively involved in metabolic processes.
  • There are three types of specialized cells in human bones: osteoblasts, osteocytes, and osteoclasts.
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