BIO 211 Lecture 5: Unit E: Skeletal System

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16 Jan 2019
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Unit e: skeletal system: skeletal system in general, basic functions. Ex. ossicles of inner ear: muscle contraction exerting a pull on skeleton, can alter direction and magnitude of forces generated by muscles, take force and amplify it. Storage of mineral and energy reserves: ca2+ essential for, muscle contraction, blood clotting, nerve impulse transmission, po4, atp utilization, plasma membrane, lipids stored in yellow bone marrow of adult bones, anatomical classes of bones. Long bones: greater in length than width, elongated, cylindrical shaft (diaphysis, most common bone shape, found in upper and lower limbs (humerus, femur) Short bones: length nearly equal to width, carpal bones (wrist bones), tarsals (foot bones) Flat bones: flat, thin surfaces, may be slightly curved ( fossa", provide surfaces for muscle attachment, protect underlying soft tissues, roof of skull, scapulae, sternum, ribs. Blasts: babies that build: clasts: demolition crew; breaks down bone, attached to bone by numerous collagen fibers (perforating) 4 cell types: osteoprogenitor, osteoblasts, osteoclasts, osteocytes.

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