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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.
the separation of large fat molecules into smaller drops for easy digestion.
the osmotic pressure that develops within the cells of a root system that causes the sap to rise...
the teeth found at the back of the mammalian jaw. In herbivores they have broad surfaces and...