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a small body of modified cardiac muscle cells in the upper right corner of the wall of the right atrium that acts as a pacemaker, initiating and maintaining the heartbeat.
(also called vascular tissue) the tissues that transport water and dissolved food in a...
outer body tissue layer that forms the epithelium and nervous tissue.
(also called caustic soda) a white solid, available in pellets, flakes or granules, with the...