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Definition of faint of heart. : lacking the courage to face something difficult or dangerous âusually used in the phrase not for the faint of heart This is a difficult climb that is not for the faint of heart.
A heart murmur is a continuous sound that is audible with a common stethoscope, produced when blood passes through particular areas of the heart. The heart has four chambers, two atria (singular = atrium) and two ventricles separated by a skeleton of cartilage that separates each chamber. Turbulent blood flow within the heart causes abnormal sounds called murmurs. 2  Most murmurs are functional, or physiologic, and are normal. 3  Some murmurs are due to abnormal function of the valves in the heart.