| ejaculum |
ejaculate (def. 2).
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| ejection c.’s |
see under sound.
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| ejection f. |
the proportion of the volume of blood in the ventricles at the end of diastole that is ejected during systole; it is the stroke volume divided by the end-diastolic volume, often expressed as a percentage. It is normally 65 ± 8 per cent; lower values indicate ventricular dysfunction.
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| ejection m. |
a type of systolic murmur occurring predominantly in midsystole, at the time of maximal ejection volume and blood flow velocity, such as that heard in aortic or pulmonary stenosis; it is due to ejection of blood into the root of the aorta or pulmonary artery, is diamond-shaped, and ends before the second heart sound. Cf. regurgitant m.
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| ejection p. |
the second phase of ventricular systole, being the period intervening between the opening and closing of the semilunar valves, during which the blood is being discharged into the aortic and pulmonary arteries. It can be divided into an initial period of rapid ejection followed by a period of reduced ejection as aortic and ventricular pressures decline from their peak. Called also ejection phase and sphygmic p. See illustration at cardiac cycle, under cycle.
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