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1. abduction- moving a body part away from the midline.

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2. adduction- moving a body part toward the midline.

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3. cardiac muscle- forms the walls of the heart and contracts to circulate blood.

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4. circumduction- moving in a circle at a joint, or moving one end of a body part in a circle while the other remains stationary.

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5. contract- become short and thick which causes movement.

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6. contractibility- muscle fibers that are stimulated such as nerve impulse.

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7. contracture- a fixed tightening of muscle, tendons, ligaments, or skin.

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8. dorsiflexion- bending backward or bending the foot toward the knee.

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9. elasticity- allows the muscle to its original shape after it has contracted or stretched.

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10. excitability- irritability, the ability to respond to a stimulus such as nerve impulse.

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11. extensibility- the ability to be stretched.

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12. extension- increasing the angle between two bones or straightening a body part.

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13. fascia- tough, sheetlike membrane that covers and protects the tissue.

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14. flexion- decreasing the angle between two bones, or bending a body part.

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15. insertion- the end that moves when the muscle contracts.

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16. involuntary- function without conscious thought or control.

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17. muscle tone- state of partial contraction.

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18. muscular system- more than 600 muscles make up the system.

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19. origin- when a muscle attaches to the bone, the end that does not move.

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20. plantar flexion- bending forward or bending the foot away from the knee.

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21. pronation- turning a body part downward.

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22. rotation- turning a body part around its own axis.

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23. skeletal muscle- attached to bones and causes body movement.

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24. supination- turning a body part upward.

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25. tendons- strong, tough, fibrous connective-tissue cords.

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26. visceral( smooth) muscle-found in the internal organs of the body.

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27. voluntary- under conscious control muscles that we can move if we want.