Cardiac Cycle

The 'Lub' sound of the heart is caused by .....

• Atrioventricular valves closing

• Semilunar valves closing

• Blood flowing through the Pulmonary artery and aorta

• Blood Flowing down into the 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

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

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

Tags

NGSS.MS-PS3-5

Define diastole

• when the heart is relaxing

• when the heart is contracting

• duration of the cardiac cycle

• frequency of the cardiac cycle

Define systole

• when part of the heart is contracting

• when part of the heart is relaxing

• duration of the cardiac cycle

• frequency of the cardiac cycle

All of the following occur when the ventricles contract except

• the AV valves close
• blood is ejected into the aorta
• the semilunar valves open
• blood from the pulmonary trunk enters the atria

The semilunar valves are only open during which phase

• atrial contraction and ventricular filling
• isovolumetric contraction
• ventricular ejection
• isovolumetric relaxation

What is stroke volume?

• the volume of oxygen transported in the blood

• the volume of blood pumped out of the heart each minute

• the volume of blood pumped out of the heart in each beat

• the number of beats per minute

The number of times your heart beats in 1min (bpm)

• Heart Rate

• Stroke Volume

• Cardiac Output