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UCM BIOL 3401 - Human Anatomy

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BIOL 3401 1st Edition Lecture 4Human Anatomy Bone Marrow- Red marrow (myeloid tissue)o Nearly every bone in a child o In adults, found in skull, vertebrae, ribs, sternum, pelvic girdle, proximal head of humerous and femur o Hemopletic tissue- produces red blood cells - Yellow marrow o Found in adults o Most red marrow turns into fatty yellow marrow o No longer produces blood - Bone cells o Some reabsorb bone matrix o Osteoblasts- bone forming cells Syn., soft organic matrix, which hardens by mineral deposit  Osteocytes- traps osteoblasts in the lacuna o Osteoclasts- bone dissolving cells Found on bone surface Unusually large cells, most have 3 to 4 nuclei but can have as much as 50 - Hormones reduces calcium o Calicitonin Stimulates osteoblasts activity  Reduces osteoclasts These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute. Reduces how much calcium is transported into the blood o Parathyroid Increases osteoclasts  Releasing calcium into the blood  Osteoporosis Joints and their classification - Joint- any place where bones meet, they do not have to move - Joint name- typically derived from the names of the bones involved o Acrioclavicular joint- AC o Radiounlnar joint- elbow - 4 major categories o Bony jointso Fibrous o Cartilaginous o Synovial - Bony joints o Synostosiso Immovable joint o Fibrocartilage fills gap between bones o Costal cartilage- ribs - Fibrous joint o Synarthrosiso Largely immovable, little wiggle room o Two bones are connected by fibrous connective tissue o Sutures - Cartilaginous joints o Amphiarthrosis joints o 2 bones are linked by cartilageo Bending o Intervertebral disc- Synovial joint o Diarthrosiso Freely movable o Linked by joint cavity - Articular cartilage- hyaline cartilage layer covering the facing surfaces of two bones o 2-3 mm thick - Joint (articular) cavity- separates articular surfaces - Synovial fluid o Egg white (viscous), slippery textureo Nourishing articular cartilage o Removes waste o Movement almost friction


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