body systems bones and muscles. skeletal system 4 functions of the skeletal system key role in...
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Body Systems
Bones and Muscles
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Skeletal System
4 Functions of the skeletal systemkey role in movement • provides a strong, stable &mobile
framework on which muscles can act
Supports and protects internal organsStorage centers for essential body minerals (ex: calcium and phosphorus)Manufactures blood cells
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Structure of the Skeletal System
206 bonesAxial skeleton
80 bones of the skull, spine, ribs, and sternum(breastbone)
Appendicular skeleton126 bones of the shoulders, arms, hands, hips, legs, and feet
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Types of Bones
Four types of bones:Long-FemurShort-WristFlat-RibIrregular-vertebrae
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Cartilage and Joints
Cartilage-strong, flexible connective tissueJoints-the point at which two bones meet.
Ball and Socket Joint-ShoulderPivot Joint-head & neckEllipsoidal Joint-wristHinge Joint-elbow
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Ligaments and Tendons
LigamentsTough bands of fibrous, slightly elastic tissue that bind the bone ends at the joint.
TendonsFibrous cords that join muscle to bone or to other muscles.
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Types of Muscles
Cardiac Muscles:Special type of striated tissue that forms the walls of the heart.
Smooth Musclesconcerned with movements of internal organs-(involuntary) intestines
Skeletal Muscles striped muscles, or striated, that are attached to bones that cause body movements-(voluntary)
• Flexors-muscles that close a joint• Extendors- muscles that open out a joint
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Muscles:“Use it or lose it”
Atrophy-unused muscles waste away
Muscle tone- the natural tension in the fibers of a muscle.
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Osteoporosis Jigsaw
Create a poster that addresses your myth
Must include information about the myth • at least 3 key points & 3 images
Neatly done with all group member’s names
Present info to the rest of the class