5Anatomy of a Long Bone spongy bone Proximal compact bone epiphysis diaphysisyellow marrowDistalepiphysiscartilage
6Functions of the Skeletal System SupportFramework that supports body and cradles its soft organsProtectionFor delicate organs, heart, lungs, brainMineral storageCalcium & phosphateMovementBones act as levers for musclesBlood cell formationHematopoiesis (marrow)
7The Spine The spine is the central support for the body. The spina is made up of separate bones calles vertebrae.Between each vertebrae is cartilage which keeps bone from rubbing against each other.26 vertebrae in the human body!
8Rib Your rib is made up of 12 vertebrae. It protects your heart from knocks and bumps
9Hands and feet The bones in your hands and feet are VERY flexible. The foot has 26 bones.The hand has 27 bones.
10Place where two or more bones meet JointsPivotPlace where two or more bones meetHingeGlindingBall-and-Socket Joint
11Synovial Joint Movement ExtensionRotationFlexionAdductionAbduction
12Diseases of the Skeletal System: Osteoporosis- bone reabsorption outpaces bone deposit; bones become lighter and fracture easierFactors:age, gender (more in women)estrogen and testosterone decreaseinsufficient exercise (or too much)diet poor in Ca++ and proteinabnormal vitamin D receptorssmoking
14Review (in pairs) 1. Describe 4 functions of bones. 2. Describe each type of joint3. Describe two diseases that affect the skeletal system.4. Red bone marrow produces blood cells. Children have red bone marrow in their long bones, while adults have yellow bone marrow, which stores fat. Why might adults and children have different kinds of marrow?5. What might happen if children´s bones didn´t have growth plates of cartilage?