Cardiac Physiology

The heart lies in the left half of the thoracic cavity

Which of the following is the proper sequence of cardiac excitation?

Sympathetic stimulation of the heart

It received O2 poor blood from the venae cavae

Pumps O2 rich blood into the aorta

pumps O2-poor blood

into the pulmonary artery

receives O2-rich blood

from the pulmonary veins

prevents backflow of blood from the ventricles to the atria

prevents backflow of

blood from the arteries

into the ventricles

The first heart sound is associated with the closing of

the _______(AV/semilunar) valves and signals the onset of ____________(systole/

diastole), whereas the second heart sound is associated with

closing of the _________(AV/semilunar) valves and signals the onset of

_____________(systole/diastole).

(a)