Skeletal System Notes

Functions Give Shape & Support Protect soft organs Regulate and store body minerals and fat Produce red blood cells Bone Tissue Composed of bone cells embedded in a web of inorganic salts (calcium & phosphorus) IF starts as cartilage then may become Compact or dense bone Spongy or cancelous bone Red marrow – found inside long bones - makes red blood cells Yellow marrow - inside other bones - stores fat

Upper And Lower Extremities Humerous, Tibia, Femur, Ulna, Metacarples Example: txtbk. Pp. 478-479 Bone Types Description Examples Long Longer Then Wide Works As Levers Upper And Lower Extremities Humerous, Tibia, Femur, Ulna, Metacarples Short Cube Shaped Wrists, Ankles Flat Broad Surface Protects Organs Muscles Attach To Ribs, Sternum, Cranial Bones, Bones Of Shoulder Girdle Irregular All Others That Don’t Fit previous Categories Vertebrate, Few In Skull

Compact Bone compared to Spongy Bone Dense Hard Found on outside of ones for protection AKA – cancellous bone Under the compact bone Porous – full of holes In most bones Calcium Phosphorous collagen

Joint – where 2 bones come together Joint Types Joint – where 2 bones come together Joint Type Movement Ball & Socket Circular Hinge Back & forth Pivot Pivots Gliding Sliding Cartilaginous Immovable