EBR EMS Chapter 7 Definitions
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| abduction | moving away from the center or midline
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| actin | contractile protein found in the skin myofilament of skeletal muscle
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| adduction | moving toward the center or midline
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| all or none | when stimulated, a muscle fiber will contract fully or not at all
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| antagonist muscle | those having opposing actions
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| bursa | small cushionlike sacs found between moving body parts
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| carpal tunnel syndrome | muscle weakness pain and tingling in the radial side of the wrist, hand, and fingers
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| concentric contraction | type of isotonic muscle contraction in which a muscle's length decreases
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| disuse atrophy | when prolonged inactivity results in the muscles getting smaller in size
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| dorsiflexion | when the top of the foot is elevated with the toes pointing upward
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| eccentric contraction | type of isotonic muscle contraction in which a muscle's length increases under a load
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| eversion | foot movement that turns the ankle so that the sole faces out to the outside
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| extension | increasing the angle between two bones at a joint
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| fatigue | loss muscle power
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| flexion | act of bending, decreasing the angle between two bones at the joint
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| hypertrophy | increased size of a part caused by an increase in the size of its cell
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| hypothermia | subnormal core body temp below 37 degrees C
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| insertion | attachment of a muscle to the bone that it moves when contraction occurs
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| inversion | foot movement that turns the ankle so that the sole faces inward townard the midline of the body
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| isometric contraction | type of muscle contraction in which muscle does not shorten
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| isotonic contraction | of the same pressure or tension
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| motor neuron | transmits nerve impulses from the brain and spinal cord to muscles and glandular epithelial tissues
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| motor unit | a single motor neuron with the muscle cells it innervates
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| myofilament | ultramicroscopic , threadlike structures found n myofibrils
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| myosin | contractile protein found in the thick filaments of skeletal muscle
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| neuromuscular junction | the point of contact between the nerve endings and muscle fibers
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| origin | the attachment of a muscle to the bone that does not move when contraction occurs, as distinquished from insertion
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| oxygen debt | continued increased metabolism that occurs in a cell to remove excess lactic acid that resulted from exercise
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| paralysis | loss of the power of motion, especially voluntary motion
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| plantar flexion |
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| posture | k
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| prime mover | k
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| pronation | k
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| rotation | k
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| sarcomere | k
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| sliding filament theory | k
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| supination | k
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| synergist muscle | k
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| tendon | k
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| tensynovitis | k
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| tetanic contraction | k
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| threshold stimulus | k
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| tonic contraction |
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