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an artificial device that helps to stimulate and regulate the heart muscle.
a large tongue-shaped organ in the mammalian body which secretes hormones and digestive enzymes...
a mixture of enzymes and other substances secreted by the exocrine cells of the pancreas.
ground tissue with thin-walled cells that makes up most of the plant body. These cells are used...
small solid particles of matter such as soot, ash, metal and dust.