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In normal fetal circulation the path of oxygenated blood returning from the placenta passes though several fetal shunts. One of these normal fetal pathways between the aorta and PA can be described as a: a- LR shunt termed the PDA b- RL shunt termed the PDA c- LR shunt termed the foramen ovale d- RL shunt termed the foramen ovale - the PA-AO shunt is the PDA and its right to left. When the left heart pressure begins to exceed the right heart pressure, that such a shunt would switch to left to right What is the name of the coronary arteries which normally branch off the Cx artery towards the apex of the heart? a- diagonal branches b- OM branches c- acute marginal branches d- posterior descending branches - The left sided AV groove artery is the Cx and its branches are termed OMs The aortic dicrotic notch marks the beginning of ventricular: a- systole b- isometric relaxation c- end diastolic pressure d- slow filling phase - B. The systolic pulse is divided by a midsystolic dip indicating a sudden ejection followed by increased resistance and then secondary release. End-diastolic stretching of the ventricular muscle fibers is termed: a- preload b- afterload c- inotropismd- chronotropism - Preload refers to the filling of the ventricular chambers in diastole The greatest expenditure of O