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The tricuspid valve, located between the right atrium and the right ventricle; the pulmonary (pulmonic) valve, between the right ventricle and the pulmonary artery; the mitral valve, between the left atrium and left ventricle; and. the aortic valve, between the left ventricle and the aorta.
I think it’s erosion... not sure what you’re asking
Fight or flight, because according to Hans Selye, this occurs at times of danger when your adrenaline is heightened.