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T OR F: congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues
T OR F: the "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's semilunar valve
T OR F: as pressure in the aorta rises due to athersclerosis, more ventricular pressure is required to open the aortic semilunar valve
T OR F: cardiac muscle has more mitochondria and depends less on a continual supply of oxygen than does skeletal muscle
T OR F: the aortic semilunar valve opens when pressure in the aorta is higher than the ventricular pressure
hemorrhage with a large loss of blood causes:
a lowering of blood pressure due to change in cardiac output
to auscultate the aortic semilunar valve, you would place your stethoscope
in the second intercostal space to the right of the sternum
if cardiac muscle is deprived of its normal blood supply, damage would primarily result from:
decreased delivery of oxygen
which vessel of the heart receives blood during right ventriuclar systole
pulmonary arteries and aorta, both A and B are correct
during the period of ventricular filling:
blood flows passively through the atria and the open AV valves
correct statement about the function of myocardial cells
the all-or-none law as applied to cardiac muscle means that the entire heart contracts as a unit it it does not contract at all
correct statement about the heart valves
the AV valves are supported by the chordae tendineae so that they do not blow back up into the atria during ventricular contraction
correct statement about the structure of the heart wall
the myocardium is the layer of the heart that actually contracts
the effect of endurance-type athletic training may be to lower the heart rate. this phenomenon:
is caused by hypertrophy of the heart muscle
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