Skeletal System. An adult skeletal system is made up of 206 bones. Bones serve the following functions (purposes): 1. supporting framework 2. area for.

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Presentation transcript:

Skeletal System

An adult skeletal system is made up of 206 bones. Bones serve the following functions (purposes): 1. supporting framework 2. area for muscles to attach 3. protect organs 4. storehouse for minerals 5. center for production of RBC and some white

COMPOSITON OF BONE TISSUE: 1. LIVING CELLS 2. HARD MINERALS A. CALCIUM PHOSHATE B. CALCIUM CARBONATE

Structure of Bone: 1. Joint: place where bones meet 2. Periosteum: hard outer layer 3. Articular Cartilage: covers the ends of bone: smooth for sliding 4. Spongy Bone: ends of bone, absorbs shock; contains red marrow and produces red blood cells 5. Medullary Canal: middle of shaft; contains yellow marrow

7. Haversian Canal : channels which contain blood vessels which supply nourishment to bone cells 8. Epiphyseal Line: growth plate 9. Marrow: soft layer in hollow of bone > red-ends of bone > yellow- fat cells 10. Osteoporosis: ‘brittle bones’

Permanent Cartilage: 1.Ears 2.Back : In between vertebrae 3.Ribs 4.Nose-septum 5.Larynx 6.Trachea 7.Articular Cartilage: end of bones

BUILDING BONE TISSUE: Three conditions necessary for growth and hardening of bone: 1.Adequate supply of minerals: calcium, phosphorus 2.Chemical substances need to be present for bone cells to make use of minerals 3.Hormones needed for proper growth Bones store the body’s supply of phosphorus and calcium. Bones become stronger with use!