Exam 9: Cardiac Physiology

A swishy murmur heard between the second and first heart sounds is indicative of a(n) ____________ valve.

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 -Has the fastest rate of pacemaker activity

An increase in venous return would increase preload and decrease ESV.

Use this figure to answer the corresponding questions. -Which structures are open during isovolumetric relaxation? a.1 and 2 b.1 and 3 c.2 and 4 d.1, 2, 3, and 4 e.none of these

The ____________________ is equal to the cardiac output divided by the heart rate.

The presence of _______ within intercalated discs allow the heart's contractile cells to work together as a functional syncytium.

The second heart sound is due to closure of the AV valves.

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 -Pressure differences that do not occur in a normal heart

Ventricular ejection occurs once the afterload has been overcome.

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.Duration of the refractory period in cardiac muscle B.Duration of the refractory period in skeletal muscle

Match the characteristic with the appropriate term(s). a.tricuspid valve b.bicuspid valve c.mitral valve d.pulmonary valve e.aortic valve f.all heart valves g.aortic valve; pulmonary valve h.bicuspid valve; mitral valve i.tricuspid valve; bicuspid valve j.tricuspid valve; pulmonary valve k.mitral valve; aortic valve l.fibrous skeleton m.chordae tendineae n.oxygenated blood o.deoxygenated blood -Prevents backflow of blood into the left ventricle

Cardiac output is equal to the EDV-ESV.

Match the characteristic with the appropriate term(s). a.tricuspid valve b.bicuspid valve c.mitral valve d.pulmonary valve e.aortic valve f.all heart valves g.aortic valve; pulmonary valve h.bicuspid valve; mitral valve i.tricuspid valve; bicuspid valve j.tricuspid valve; pulmonary valve k.mitral valve; aortic valve l.fibrous skeleton m.chordae tendineae n.oxygenated blood o.deoxygenated blood -Oxygenated blood passes through these valves

Most blood flow through the coronary vessels occurs during ventricular systole when the heart is driving blood forward.

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.Duration of diastole at resting heart rate B.Duration of diastole at rapid heart rate during exercise

Decreasing venous return ____________________ preload and ____________________ EDV.

Match the characteristic with the appropriate term(s). a.tricuspid valve b.bicuspid valve c.mitral valve d.pulmonary valve e.aortic valve f.all heart valves g.aortic valve; pulmonary valve h.bicuspid valve; mitral valve i.tricuspid valve; bicuspid valve j.tricuspid valve; pulmonary valve k.mitral valve; aortic valve l.fibrous skeleton m.chordae tendineae n.oxygenated blood o.deoxygenated blood -Type of blood flowing through the right AV valve

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.Stroke volume when end-diastolic volume equals 130 ml B.Stroke volume when end-diastolic volume equals 160 ml

If the cardiac output is 4,800 ml/min and the heart rate is 60 beats per minute, the stroke volume averages ____ ml.

The aortic valve prevents backflow of blood from entering the left ventricle during ventricular diastole.