BIOL 261 Lecture Notes - Lecture 6: Rib Cage, Thoracic Cavity, Skeleton

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10 Nov 2020
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Bone is hard and rigid; cartilage is flexible yet strong. Cartilage in nose, external ear, thoracic cage and trachea. Skull around brain; ribs, sternum, vertebrae protect organs of thoracic cavity. Produced by muscles attached to bones via tendons. Ligaments allow some movement between bones but prevent excessive movement. Calcium and phosphate stored and released as needed. Bone marrow that gives rise to blood cells and platelets. Hyaline cartilage attaches ribs to the sternum covers the ends of some bones cartilage within growth plates: model for formation of most bones. Fibrocartilage: weight-bearing cartilage that withstands compression forms intervertebral discs forms pubic symphysis forms cartilage pads of the knees. Bone composition: bone matrix has organic and inorganic components, organic components. Harden matrix and account for rigidity of bones. Precursors of hydroxyapetite stored in vesicles, then released by exocytosis. Surrounded by matrix, but can make small amounts of matrix to maintain it.

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