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Quel est le rôle principal des sigmoïdes (valve semi-lunaire) dans le système cardiovasculaire ?
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- Osteon: a structural unit of compact bone consisting of a central canalsurrounded by concentric cylindrical lamellae (layer) of matrix.• Central (Haversian) Canal: runs longitudinally through long bones for bloodvessels and nerves to travel.• Lamellae: onion-like layers surrounding the central canal.• Lacunae: spaces for cells to reside.• Canaliculi: channels running between lacunae allowing communicationbetween osteocytes (mature bone cells).Appearance: calcified matrix arranged in concentric lamellaearound central (haversian) canals; osteocytes in lacunae; lacunaeinterconnected by canaliculi.• Functions: physical support of body; leverage for muscle action;protects viscera; reservoir of calcium and phosphorus.• Locations: skeleton.