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The Skeletal System


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The Skeletal System

  1. 1. The SkeletalSystemT- 1-855-694-8886Email- info@iTutor.comBy
  2. 2. The Skeletal System The framework of the body, consisting of bones andother connective tissues, which protects and supportsthe body tissues and internal organs.Copyright reserved. 2012 The E Tutor The skeletal system servesmany important functionsincluding:1. It protects the vital organssuch as the brain, heart,and lungs.2. It gives your body shapeand form.3. It allows for movement.4. It produces blood cells andstores minerals.
  3. 3. What is bone? Compact bone provides most ofthe strength and support. Cancellous bone has manyopen spaces like a sponge.Copyright reserved. 2012 The E Tutor In many bones (like the femur), thecancellous bone protects the innermostpart of the bone called bone marrow. Bone marrow is a thick, jelly-like layerthat makes blood cells or stores fat.
  4. 4. Functions of BoneAll the bones in your body make up your skeletal system The functions of the Bone:1. Support – provides framework, supports soft tissues andprovides points of attachment for skeletal muscles.2. Protection – internal organs are protected by skeleton,ex. Heart and lungs are protected by ribs.3. Movement – when muscles contract, they pull on bonesand produce movement.4. Mineral Storage – homeostasis mechanism thatdeposits and removes calcium and phosphorus ondemand.5. Blood Cell production – red bone marrow producesblood cells; a process called hematopoietic.6. Storage of energy – yellow bone marrow stores lipids,an important source of chemical energy.Copyright reserved. 2012 The E Tutor
  5. 5. Classification of bone1. Long – Long bones arelonger than they are widewhereas Ex. legs, toes,arms, fingers2. Short- include the bones ofthe wrist (carpal) and ankles(tarsal)3. Flat – are thin and relativelybroad Ex-cranial, sternum,ribs, scapulas4. Irregular – have complexshapes that do not fit easilyinto any other category Ex.vertebraeCopyright reserved. 2012 The E Tutor Bones are grouped according to their shape
  6. 6.  A long bone has a central shaft, ordiaphysis and an expanded portion ateach end or epiphysis. The diaphysis surrounds a centralmarrow cavity. The ends or epiphyses are covered bycartilageCopyright reserved. 2012 The E TutorCartilage Smooth, rubbery blue-white connectivetissue Acts as a shock absorber between bones Elastic than bone Makes up the flexible parts of theskeleton such asthe outer earthe tip of the nose
  7. 7. Articular Cartilage Covers the surfaces of bones thatform joints Make smooth joint movementpossible Protect the bones from rubbingagainst each otherCopyright reserved. 2012 The E Tutor The place where two bones meet is calleda joint. Some joints are fixed while others move. Your joints have their own lubricatingfluid called synovial fluid. This fluid helps them move freely.Joints
  8. 8. Types of Joints Different types of joints make a wide range of motionspossible These includeSuturesSymphysesSynovial jointsCopyright reserved. 2012 The E Tutor206 bones in all 22 bones in skull 6 in middle ears 1 hyoid bone 26 in vertebral column 25 in thoracic cage 4 in pectoral girdle 60 in upper limbs 60 in lower limbs 2 in pelvic girdle
  9. 9. The EndCall us for moreInformation:www.iTutor.com1-855-694-8886Visit