Skip to Main Content

Chapter 30. The Heart as a Pump

A 75-year-old woman with a history of chronic congestive heart failure undergoes cardiac catheterization to determine her extent of cardiac dysfunction. During estimation of her systolic function, in what phase of the cardiac cycle should her peak left ventricular pressure occur?

A. Rapid filling

B. Isovolumetric contraction

C. Ventricular ejection

D. Atrial systole

E. Isovolumetric relaxation

The work performed by the left ventricle is substantially greater than that performed by the right ventricle, because in the left ventricle

A. the contraction is slower.

B. the wall is thicker.

C. the stroke volume is greater.

D. the preload is greater.

E. the afterload is greater.

The dicrotic notch on the aortic pressure curve is caused by

A. closure of the mitral valve.

B. closure of the tricuspid valve.

C. closure of the aortic valve.

D. closure of the pulmonary valve.

E. rapid filling of the left ventricle.

The second heart sound is caused by

A. closure of the aortic and pulmonary valves.

B. vibrations in the ventricular wall during systole.

C. ventricular filling.

D. closure of the mitral and tricuspid valves.

E. retrograde flow in the vena cava.

The fourth heart sound is caused by

A. closure of the aortic and pulmonary valves.

B. vibrations in the ventricular wall during systole.

C. ventricular filling.

D. closure of the mitral and tricuspid valves.

E. retrograde flow in the vena cava.

During exercise, a man consumes 1.8 L of oxygen per minute. His arterial O2 content is 190 mL/L, and the O2 content of his mixed venous blood is 134 mL/L. His cardiac output is approximately

...

Pop-up div Successfully Displayed

This div only appears when the trigger link is hovered over. Otherwise it is hidden from view.