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valve that separates the left ventricle from the aorta.
semi-liquid mass of partially digested food and gastric juices, produced in the stomach.
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
when a person uses their breath to help another person who has stopped breathing, in an attempt...
the thin moist surface across which gaseous exchange occurs.
the part of the hindbrain that controls autonomic functions such as breathing, digestion, heart...