Cardiac Cycle

What does diastole refer to in the cardiac cycle?

• The contraction of the heart muscles

• The relaxation of the heart muscles

• The opening of the semilunar valves

• The closing of the atrioventricular valves

What happens during atrial systole?

• The atrioventricular valves close

• The semilunar valves open

• The atria contract, decreasing their volume

• The ventricles contract

What is the result of ventricular systole?

• The relaxation of the heart muscles

• The opening of the atrioventricular valves

• An increase in atrial pressure

• A decrease in ventricular volume

How is cardiac output calculated?

• Heart rate x Stroke volume

• Heart rate / Stroke volume

• Stroke volume / Heart rate

• Heart rate + Stroke volume

What ensures the unidirectional flow of blood in the heart?

• The thickness of the muscular walls

• The contraction of the heart muscles

• The relaxation of the heart muscles

• The opening and closing of the valves

What are the semilunar valves located between?

• The left atrium and the left ventricle

• The ventricles and the arteries

• The atria and the ventricles

• The right ventricle and the pulmonary artery

What causes the atrioventricular valves to open?

• Higher pressure in the atria than in the ventricles

• Contraction of the ventricles

• Relaxation of the atria

• Higher pressure in the ventricles than in the atria

During which stage does the blood enter the atria?

• Atrial systole

• Ventricular diastole

• Diastole

• Ventricular systole

What is the effect of the ventricles contracting?

• Decrease in ventricular volume

• Increase in atrial pressure

• Decrease in atrial volume

• Increase in ventricular pressure

What does the cardiac cycle graph help to identify?

• The exact heart rate

• When the valves open and close

• The thickness of the heart walls

• The number of heartbeats per minute