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the sequence of events relating to the flow of blood or blood pressure in the heart that occurs from the beginning of one heartbeat to the beginning of the next.
a non-membrane bound structure made of proteins and nucleic acids that occurs within the nucleus...
a chemical messenger produced and released by a cell or a gland in one part of the body of the...
a sticky film that forms on the enamel of teeth. It is made up of small food particles, saliva...