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Aortic stenosis50. Aortic regurgitation51. Mitral stenosis52. Tricuspid regurgitation53. Mitral regurgitation49. ANS: B PTS: 1 REF: Page 1168 MSC: Outflow obstruction increases pressure within the left ventricle as it tries to eject blood through the narrowed opening. Left ventricular hypertrophy develops to compensate for the increased workload.50. ANS: E PTS: 1 REF: Pages 1169-1170 MSC: During systole, blood is ejected from the left ventricle into the aorta. If the aortic semilunar valve fails to close completely, then some of the ejected blood flows back into the left ventricle during diastole.51. ANS: A PTS: 1 REF: Page 1169 MSC: Mitral stenosis impairs the flow of blood from the left atrium to the left ventricle.52. ANS: D PTS: 1 REF: Page 1170 MSC: Tricuspid regurgitation is more common than tricuspid stenosis and is usually associated with cardiac failure and dilation of the right ventricle, secondary to pulmonary hypertension.53. ANS: C PTS: 1 REF: Page 1170 MSC: Mitral regurgitation permits the backflow of blood from the left ventricle into the left atrium during ventricular systole, giving rise to a loud pansystolic (throughout systole) murmur heard best at the apex that radiates into the back and axillae.