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| attaches to bones for voluntary movement it; contains striated multinucleated, long cells |
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| contains spindle-shaped cells; it lines the gut , blood vessels, and glands; its operation is involuntary |
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| composed of short, striated cells that can function n units |
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| exerts the greatest control over the body’s responsiveness to changing conditions |
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| Eleven organ systems in vertebrates contribute |
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| to the survival of the living cells of the body |
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| the nucleus and metabolic machinery for protein synthesis |
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| are numerous, usually short extensions that receive stimuli |
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| is usually a single, rather long extension that transmits impulses to other cells at its branched ending; signals actually arise in the trigger zones |
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| A neuron at rest maintains |
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| a steady voltage difference across its plasma membrane |
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| The inside (cytoplasmic fluid) |
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| is more negatively charged than the outsde (extracellular fluid) |
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| resting membrane potential |
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| When a neuron receives signals, an abrupt, temporary reversal |
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| the inside becomes more positive--in the polarity is generated |
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