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the rapid loss of water from the body.

feeling extreme physical or mental tiredness brought on by extreme exertion.

the body's reaction to a change that requires physical, mental or emotional response.

when the muscle shortens, tending to bulge.

when the muscle gradually lengthens, shortening to its original length and shape.

a state of complete physical, mental and social wellbeing and not merely the absence of disease or infirmity.