THE SKELETAL AND MUSCULAR SYSTEMS SKELETAL SYSTEM THE AVERAGE PERSON HAS 206 BONES.
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Transcript of THE SKELETAL AND MUSCULAR SYSTEMS SKELETAL SYSTEM THE AVERAGE PERSON HAS 206 BONES.
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THE SKELETAL AND MUSCULAR SYSTEMS
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SKELETAL SYSTEM
THE AVERAGE PERSON HAS 206 BONES
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BONES ARE HELD TOGETHER BY LIGAMENTS
LIGAMENT
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TENDONS ARE CONNECTIVE TISSUES THAT ATTACH BONE TO MUSCLE
ACHILLES TENDON
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FUNCTIONS
• GIVES SHAPE AND SUPPORT
• ALLOWS MOVEMENT
• PROTECTS TISSUES AND ORGANS
• STORES CERTAIN SUBSTANCES
• PRODUCE BLOOD CELLS
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DEVELOPMENT OF BONES
• CARTILAGE CONNECTIVE TISSUE THAT FORMS BONES
• STRONG ENOUGH TO SUPPORT WEIGHT BUT FLEXIBLE
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• BONE REPLACES CARTILAGE ABOUT SEVEN MONTHS BEFORE BIRTH
• CARTILAGE REMAINS IN JOINTS, EARS, AND NOSE
– ACTS AS A CUSHION
– PROVIDES SLIPPERY SURFACE FOR BONE MOVEMENT
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STRUCTURE OF BONES
• BONE IS ONE OF TOUGHEST AND LIGHTEST MATERIALS IN THE BODY
• 206 BONES MAKE UP ABOUT 14% OF BODY MASS
• BONES ARE ALIVE – NERVES, BONE-FORMING CELLS, AND BLOOD VESSELS
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• BONES ARE LIKE ROCKS – HARD AND STRONG
– MINERALS MAKE BONES HARD AND STRONG
• CALCIUM AND PHOSPHORUS
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THE BONE
• HOLLOW SHAFT
– YELLOW MARROW – FAT AND BLOOD VESSELS
– RED MARROW – PRODUCES BLOOD CELLS
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SURROUNDING THE SHAFT – MEMBRANE CONTAINS BONE-FORMING CELLS AND BLOOD VESSELS
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• MUSCLES ATTACH TO BONE SURFACE
• RUNNING THROUGH THE BONE SYSTEM IS A SYSTEM THAT BRINGS FOOD AND OXYGEN
• IT ALSO CONTAINS NERVES
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SKELETAL JOINTS
• JOINT – WHERE BONES COME CLOSE TOGETHER
• MOVEABLE JOINTS – ALLOW BONES TO MOVE
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BALL AND SOCKET
ALLOWS FOR CIRCULAR MOTION
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HINGE JOINT
ALLOWS FORWARD AND BACKWARD MOVEMENT
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PIVOT JOINT
ALLOWS BONES TO MOVE OVER EACH OTHER
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THE MUSCULAR SYSTEM
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• THE ONLY TISSUE THAT CONTRACTS OR SHORTENS
• MORE THAN 600 MUSCLES WORK WHILE YOU SLEEP TO KEEP YOU ALIVE
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MUSCLES ARE MADE OF FIBERS THAT RUN PARRALLEL TO ONE ANOTHER AND ARE HELD TOGETHER BY BUNDLES OF CONNECTIVE TISSUE
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SKELETAL MUSCLES
• ALLOWS MOVEMENT
• ASSOCIATED WITH BONES
• STRIATED OR BANDED
• VOLUNTARY – YOU CAN CONTROL
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SMOOTH MUSCLE
• CONTROL BREATHING, BLOOD PRESSURE, ETC.
• DO NOT HAVE BANDS
• INVOLUNTARY YOU DO NOT CONTROL
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CARDIAC MUSCLE
• HEART
• WEAVE A COMPLEX MESH
• INVOLUNTARY
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ACTIONS
• MUSCLES WORK IN PAIRS
• NERVE TISSUE IS INVOLVED
• MUSCLE CONTRACTS COMPLETELY OR NOT AT ALL
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INJURIES TO SKELETAL AND MUSCULAR SYSTEM
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SPRAIN
LIGAMENT IS TORN OR PULLED BEYOND NORMAL RANGE
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FRACTURE
BREAK IN BONE
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– HEALING BEGINS IMMEDIATELY– BROKEN BLOOD VESSELS FORM CLOT– MINERALS FROM SHARP ENDS
ABSORBED– CONNECTIVE TISSUE GROWS TO HOLD
BONE ENDS TOGETHER
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DISLOCATION
• A BONE IS FORCED OUT OF IT’S JOINT– THIS NEEDS A
DOCTOR TO PUT IT BACK