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Bone tissue
Question | Answer |
---|---|
2 structural components of connective tissue | Compact bone: dense form of bone Spongy bone (cancellous) porous bone |
General structure | Bone matrix & Bone cells |
Bone matrix Organic substances | Sugar Proteins Mainly collagen Contribute to bone structure, flexibility & tensile strength (allow bone to resist stretch and twisting ) |
Bone matrix Inorganic substances | Minerals Salts Largely calcium phosphate Give bone characteristic of hardness & resistance to compression |
Osteocytes | : mature bone cells that monitor & maintain the bone matrix |
Osteoblasts | : immature bone cells that aree responsible for making bone matrix |
Osteoclasts | bone resorbing cells |
Bone stems cells | source of new bone cells |
Bone matrix | group of osteons (one placed outside the next line growth rings of a tree) |
Compact bone | The structural unit of compact bone is called osteon (haversian system) Elongated cylinder orientated parallel to the long axis of the bone Function: tiny weight bearing pillars that give structure & support |
Lumella | matrix tube Running through the core of each osteon is the cneetral canal (haveersian canal) Containing blood vessels & nerve fibres that srve the osteons tissue |
Canaliculi | tie all the osteocytes together, allowing them to communicate & permitting nutrients & waste to be circulated |