Cardiac Cycle

What are the four chambers of the heart?

• One atrium and three ventricles

• Three atria and one ventricle

• Two ventricles and two atria

• Two atria and two ventricles

What is the function of the atria in pumping blood?

• They actively pump blood into the ventricles

• They assist the ventricles in pumping blood

• They receive blood from the pulmonary circulation

• They receive blood from the systemic circulation

What are the valves between atria and ventricles called?

• Semilunar valves

• Atrioventricular valves

• Pulmonary valves

• Aortic valves

What does systole mean in the context of the cardiac cycle?

• Filling

• Contraction

• Relaxation

• Ejection

During which phase of the cardiac cycle do all valves close and ventricles contract as closed chambers?

• Outflow

• Isovolumetric contraction

• Inflow

• Isovolumetric relaxation

What occurs during the rapid ventricular filling phase?

• Blood flows from the atria into the ventricles

• Ventricles contract as closed chambers

• Atria actively pump blood into the ventricles

• Atrioventricular valves close

What is the duration of one cardiac cycle at a normal heart rate of about 75/min?

• 0.5 second

• 0.3 second

• 0.8 second

• 0.7 second

What is the duration of diastole in the cardiac cycle?

• 0.3 second

• 0.1 second

• 0.7 second

• 0.5 second

What occurs during the ejection phase of the cardiac cycle?

• Slow ejection of blood

• Rapid ventricular filling

• Atrial systole

• Isovolumetric relaxation

When does atrial systole occur in the cardiac cycle?

• During isovolumetric contraction

• During the rapid ventricular filling

• During the ejection phase

• During the end of the ventricular diastole