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a small, corky pore or narrow line on the surface of the stem of a woody plant that allows the interchange of gases between the interior tissue and the surrounding air.
a sudden severe instance of abnormal heart function accompanied by chest pains and possible...
the sequence of events relating to the flow of blood or blood pressure in the heart that occurs...
the tube that carries urine from the nephrons to the ureter via the renal pelvis.
highly addictive substance found in tobacco that accelerates the heart rate, and contracts and...
an antigen preparation that stimulates the immune system to give protection against a particular...