Body Systems Bones and Muscles

Skeletal System 4 Functions of the skeletal system key role in movement provides a strong, stable &mobile framework on which muscles can act Supports and protects internal organs Storage centers for essential body minerals (ex: calcium and phosphorus) Manufactures blood cells

Structure of the Skeletal System 206 bones Axial skeleton 80 bones of the skull, spine, ribs, and sternum(breastbone) Appendicular skeleton 126 bones of the shoulders, arms, hands, hips, legs, and feet

Types of Bones Four types of bones: Long-Femur Short-Wrist Flat-Rib Irregular-vertebrae

Cartilage and Joints Cartilage-strong, flexible connective tissue Joints-the point at which two bones meet. Ball and Socket Joint-Shoulder Pivot Joint-head & neck Ellipsoidal Joint-wrist Hinge Joint-elbow

Ligaments and Tendons Ligaments Tendons Tough bands of fibrous, slightly elastic tissue that bind the bone ends at the joint. Tendons Fibrous cords that join muscle to bone or to other muscles.

Types of Muscles Cardiac Muscles: Special type of striated tissue that forms the walls of the heart. Smooth Muscles concerned 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

Muscles:“Use it or lose it” Atrophy-unused muscles waste away Muscle tone- the natural tension in the fibers of a muscle.

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