Cardiac cycle

The 'Lub' sound of the heart's LUB DUB? are the....

• Atrioventricular valves closing

• Semilunar Valves closing

• Blood flowing through the Pulmonary Trunk and Aorta

• Blood Flowing down into the ventricles

The 'Dub' sound of the heart's LUB DUB? are the....

• Atrioventricular valves closing

• Semilunar Valves closing

• Blood flowing through the Pulmonary Trunk and Aorta

• Blood Flowing down into the venticles

What is the definition of the Cardiac Cycle?

• the sequence of events in heart during 1 min

• the sequence of events that occur during one complete heartbeat

• the contraction and relaxation of the ventricles

• the circulation of blood in the heart

During ventricular systole, which of the following occurs?

• Atrioventricular valves close and semilunar valves close

• Atrioventricular valves close and semilunar valves open

• Atrioventricular valves open and semilunar valves are open

• Atrioventricular valves open and semilunar valves close

State the phase of cardiac cycle shown in the diagram.

• Atrial systole, ventricular systole

• Atrial diastole, ventricular systole

• Atrial systole, ventricular diastole

• Atrial diastole, ventricular diastole

State the phase of cardiac cycle shown in the diagram.

• Atrial systole, ventricular systole

• Atrial diastole, ventricular systole

• Atrial systole, ventricular diastole

• Atrial diastole, ventricular diastole

During ventricular systole, which of the following occurs?

• Atrioventricular valves close and semilunar valves close

• Atrioventricular valves close and semilunar valves open

• Atrioventricular valves open and semilunar valves are open

• Atrioventricular valves open and semilunar valves close

State the phase of cardiac cycle shown in the diagram.

• Atrial systole, ventricular systole

• Atrial diastole, ventricular systole

• Atrial systole, ventricular diastole

• Atrial diastole, ventricular diastole

What causes the changes in pressure in the ventricles?

• Opening and closing of atrioventricular valves

• Opening and closing of semi-lunar valves

• Contraction and relaxation of muscles in ventricles

• Contraction and relaxation of ventricles

Which of the following is true about the semi-lunar valves in the heart?

• They are between atria and ventricles

• They close when pressure in the arteries is higher than pressure in the atria

• They prevent backflow of blood into the atria

• They open when pressure in the ventricles is higher than pressure in the arteries