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Myotonic dystrophy--the most common adult form of muscular dystrophy--is a chronic, progressive, and inherited neuromuscular condition presenting with multisystemic complications including distal muscle weakness, myotonia, hypersomnolence, early-onset cataracts, cardiac conduction abnormalities, and slurred speech and swallowing problems (Harper, 2001).
Three termsâhypotonic, isotonic, and hypertonicâare used to relate the osmolarity of a cell to the osmolarity of the extracellular fluid that contains the cells . In a hypotonic situation, the extracellular fluid has lower osmolarity than the fluid inside the cell, and water enters the cell.