Body
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| excitability | he ability to respond to a stimulus, which may be delivered from a motor neuron or a hormone
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| irritability | reaction to stimuli and for the pathological, abnormal or excessive sensitivity to stimuli
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| relax | Loosening, lengthening, or lessening of tension in a muscle
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| isometric contraction | A muscular contraction in which the length of the muscle does not change
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| isotonic contraction | muscular contraction in which the length of the muscle changes
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| contracting | either to shorten or to undergo an increase in tension
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| cardiac muscle | an involuntary, striated muscle that constitutes the main tissue of the walls of the heart
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| smooth muscle | shows no cross stripes under microscopic magnification. It consists of narrow spindle-shaped cells with a single, centrally located nucleus.
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| glycogen | a large, branched polysaccharide that is the main storage form of glucose
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| lactic acid | a hygroscopic organic acid C3H6O3 present normally especially in muscle tissue as a by-product of anaerobic glycolysis
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| strain | a stretched or torn muscle or tendon
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| spasm | a sudden involuntary contraction of a muscle, a group of muscles, or a hollow organ
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| atrophy | decrease in size of a body part, cell, organ, or other tissue
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| fibromyalgia | a chronic disorder characterized by widespread pain, tenderness, and stiffness of muscles and associated connective tissue structures
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| fascia | a sheet, or any other dissectible aggregations of connective tissue that forms beneath the skin to attach, enclose, and separate muscles and other internal organs
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| extensibility | the ability of a muscle to be stretched
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| striated muscle | a muscle tissue that features repeating functional units called sarcomeres. The presence of sarcomeres manifests as a series of bands visible along the muscle fibers, which is responsible for the striated appearance
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| muscle tone | he maintenance of partial contraction of a muscle
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| insertion point | The point or mode of attachment of a skeletal muscle to the bone or other body part that it moves
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| sprain | a stretched or torn ligament
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| aponeurosis | a sheet of pearly white fibrous tissue that takes the place of a tendon in flat muscles having a wide area of attachment
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| ligament | a short band of tough, flexible fibrous connective tissue which connects two bones or cartilages or holds together a join.
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| origin | the attachment site that doesn't move during contraction
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| cramp | a sudden, involuntary, spasmodic contraction of a muscle or group of muscles
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| inflamed | a response to cellular injury that is marked by capillary dilatation, leukocytic infiltration, redness, heat, pain, swelling, and often loss of function and that serves as a mechanism initiating the elimination of noxious agents and of damaged tissue
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| muscular dystrophy (MD) | a group of diseases that cause progressive weakness and loss of muscle mass
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| myasthenia gravis | a disease characterized by progressive weakness and exhaustibility of voluntary muscles
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| tendon | a flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone
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