Question :
61.A whistling murmur heard between the second and first heart : 1417117
61.A whistling murmur heard between the second and first heart sound would be indicative of
a.a stenotic AV valve
b.an insufficient AV valve
c.a myocardial infarction
d.an insufficient semilunar valve
e.an everted AV valve during atrial diastole
62.At rapid heart rates
a.systole and diastole shorten equally
b.systole stays almost constant, but diastole shortens
c.systole lengthens and diastole shortens
d.diastole lengthens and systole shortens
e.none of the above occur
63.Twelve complete ECG patterns are recorded over 10 seconds, which means the heart rate is ____ beats per minute.
a.60
b.72
c.90
d.108
e.120
64.If stroke volume is 80 ml and the heart rate is 70 beats per minute, the cardiac output is
a.150 ml/min
b.560 ml/min
c.5,600 ml/min
d.8,700 ml/min
e.none of the above
65.If the cardiac output is 4,800 ml/min and the heart rate is 60 beats per minute, the stroke volume averages ____ ml.
a.60
b.70
c.80
d.120
e.140
66.According to the Frank-Starling law of the heart,
a.shortening cardiac muscle fibers prior to contraction causes more forceful contractions
b.increasing venous return increases EDV, which leads to an increased stroke volume
c.as cardiac output decreases, blood pools in the vasculature and increases arterial blood pressure
d.the left ventricle must pump more blood than the right ventricle since the left ventricle must pump blood to more regions of the body
e.the greater the stroke volume, the smaller the subsequent ESV, because as more blood is squeezed out, the heart cannot fill as completely.
67.During heart failure,
a.the Frank-Starling curve shifts to the left
b.the heart pumps out a smaller stroke volume than normal for a given EDV
c.a compensatory increase in sympathetic activity increases the contractility of the heart to normal in the early stages of the disease
d.both a and c occur
e.both b and c occur
68.The term systole means
a.closure
b.conduction
c.contraction
d.opening
e.relaxation
69.Parasympathetic innervation to the heart
a.involves the vagus nerve
b.decreases the rate at which the pacemaker potential reaches threshold
c.decreases the strength of ventricular contraction
d.is characterized by all of the above
e.is characterized by only a and b
70.Sympathetic stimulation of the heart
a.increases the heart rate
b.increases the heart's contractility
c.shifts the Frank-Starling curve to the left
d.involves the release of norepinephrine
e.causes all of the above
