Multiple ChoiceMore than one choice may apply.During atrial systole,a. the atrial pressure exceeds ventricular pressure.b. 70 percent of ventricular filling occurs.c. the AV valves are open.d. valves prevent backflow into the great veins.

The chordae tendineaea. the atrioventricular valves,b. prevent the AV valve flaps from everting, c. contract the papillary muscles, d. open the semilunar valves.

The fact that the left ventricular wall is thicker than the right reveals that ita. pumps a greater volume of blood,b. pumps blood against greater resistance, c. expands the thoracic cage, d. pumps blood through a smaller valve.

Multiple ChoiceMore than one choice may apply.Which heart chamber pumps blood with the greatest amount of force?a. Right atriumb. Right ventriclec. Left atriumd. Left ventricle

Multiple ChoiceMore than one choice may apply.How many cusps does the right atrioventricular valve have?a. Twob. Threec. Fourd. Six

Discuss how the Frank-Starling law of the heart helps to explain the influence of venous return on stroke volume.

Cardiac output is equal to the (a) difference between the end-diastolic volume and the end-systolic volume, (b) product of heart rate and stroke volume, (c) difference between the stroke volume at rest and the stroke volume during exercise, (d) stroke volume less the end-systolic volume, (e) product of heart rate and blood pressure.

What three factors regulate stroke volume to ensure that the left and right ventricles pump equal volumes of blood?