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Exam 9: Cardiac Physiology

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Question 41

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Use the following answer code to compare the magnitude of the items in question. a.A is greater than b.b.B is greater than a.c.A and B are equal or nearly equal. -a.Normal stroke volume B.Stroke volume on sympathetic stimulation

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Question 42

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An increase in afterload will cause the heart to remain longer in the period of isovolumetric relaxation.

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Question 43

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Stroke volume is inversely correlated to preload; i.e., a lower preload increases stroke volume.

At rapid heart rates

An increase in parasympathetic activity ____________________ the stroke volume.

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified a.SA node b.AV node c.bundle of His and Purkinje system d.gap junctions -Normal pacemaker of the heart

An increase in cardiac sympathetic activity ____________________ the velocity of impulse conduction through the heart.

The primary function of the pericardial sac is to

Vasodilation of coronary arteries is induced by

The cardiac output is equal to

Using the following answer code, indicate which pressure relationship exists during the time in question. a.aortic pressure > ventricular pressure > atrial pressure b.aortic pressure > ventricular pressure < atrial pressure c.aortic pressure < ventricular pressure > atrial pressure d.aortic pressure < ventricular pressure < atrial pressure -When ventricular ejection is occurring

Match EKG feature with the correct characteristic. a.P wave b.QRS complex c.T wave d.PR interval e.TP interval f.ST segment -Time during which atria are repolarizing

Which of the following is not occurring at the same time when the QRS complex appears on an ECG?

An ectopic focus is the place where

Use the following answer code to indicate which factor involved in the initiation and spread of cardiac excitation is being identified a.SA node b.AV node c.bundle of His and Purkinje system d.gap junctions -Rapidly conducts the impulse down the ventricular septum and throughout much of the ventricular musculature

Use this figure to answer the corresponding questions. -The structure labeled 1 a.allows blood to pass into the ventricle b.has deoxygenated blood flowing past it c.is connected to chordae tendineae d.all of these e.none of these

The Frank-Starling law of the heart relates to how stretching of the ventricles during ventricular filling will affect stroke volume.

A heart valve opens and closes due to

If stroke volume is 80 ml and the heart rate is 70 beats per minute, the cardiac output is

The average resting heart rate is normally established by the rhythm of autorhythmic cells located near the base of the right atrium.