Biology 22- IP: cardiac cycle

During the cardiac cycle, which phase comes after isovolumetric contraction?

ventricular ejection

Indicate whether ventricular volume is increasing, decreasing, or remains unchanged during Ventricular Ejection.

ventricular volume: decrease

Select the portion on the ECG graph that precedes atrial systole.

The P wave is generated by depolarization of the atria, initiating atrial systole.

Select the portion on the ECG graph that immediately precedes isovolumetric contraction.

The QRS wave is generated by depolarization of the ventricles.

Select the portion on the ECG graph that precedes isovolumetric relaxation.

The T wave is generated by repolarization of the ventricles.

Select the heart chamber(s) that contract to complete ventricular filling.

The left and right atria contract to complete filling of their corresponding ventricular chamber.

Select the chamber(s) of the heart that should be in systole during isovolumetric contraction.

The ventricles are in systole during isovolumetric contraction.

Select the chamber(s) of the heart that are in systole during ventricular ejection.

Contraction of the ventricles pumps blood into the pulmonary and systemic circuits during ventricular ejection.

The P wave of the electrocardiogram begins right before __________.

atrial systole

During ventricular ejection, ventricular volume should _____.

decrease As the ventricles pump blood into the pulmonary or systemic circuit, the corresponding ventricular volume decreases.

During isovolumetric relaxation, ventricular pressure _____.

decrease As the ventricles relax, the pressure will decrease.

With the pulmonary valve now open, the volume of blood currently inside the right ventricle chamber _____.

decreases When the ventricles contract, the volume of blood in the right ventricle decreases as blood in the right ventricle is pumped into the pulmonary trunk.

During resting conditions, the majority of ventricular filling is caused by _________.

passive blood flow from the atrium

Select the heart valves that create the second sound of the heartbeat when they close at the beginning of isovolumetric relaxation.

pulmonary valve, aortic valve During isovolumetric relaxation, semilunar valves close, resulting in the second heart sound.

Tap or click each valve until its position is correct for the isovolumetric contraction phase.

pulmonary valve: closed tricuspid valve: closed mitral valve: closed aortic valve: closed During isovolumetric contraction, the atrioventricular and semilunar valves are closed, preventing a change in ventricular volume.

Tap or click each valve until its position is correct for the isovolumetric relaxation phase.

pulmonary valve: closed tricuspid valve: closed mitral valve: closed aortic valve: closed During isovolumetric relaxation, the atrioventricular and semilunar valves are closed, preventing blood from moving into or out of the ventricles.

ventricular filling phase

pulmonary valve: closed tricuspid valve: open mitral valve: open aortic valve: closed The atrioventricular valves are open to allow blood into the ventricle, but the semilunar valves are closed until pressure in the ventricle exceeds the pressure in the aorta and pulmonary trunk

Tap or click each valve until its position is correct for the ventricular ejection phase.

pulmonary valve: open tricuspid valve: closed mitral valve: closed aortic valve: open The semilunar valves are open to allow blood into the pulmonary trunk and aorta, but the atrioventricular valves are closed to prevent blood from flowing back into the atria.

With the pulmonary valve now closed, the volume of blood currently inside the right ventricle chamber _____.

remains constant When the pulmonary valve closes, the volume of blood in the right ventricle remains constant.

With all the valves closed and the ventricles in systole, the volume inside the right ventricle _____.

remains constant With all the valves closed, the volume of blood in the ventricle remains constant, or isovolumetric.

Select the chamber(s) of the heart that should be in diastole during isovolumetric relaxation.

right and left atrium right and left ventricle The atria and ventricles are both in diastole during isovolumetric relaxation.

What are the valve positions during isovolumetric contraction?

the atrioventricular valves and semilunar valves are both closed

The heart sounds associated with the atrioventricular valves closing occur at __________.

the start of ventricular systole

As blood flow continues into the ventricles from the atria, the ventricular pressure will _____.

increase As the ventricles fill with blood, the ventricular pressure increases.

During ventricular filling, pressure in the left ventricle should be _____ aortic pressure.

less than Because pressure in the ventricle is less than the pressure in the aorta, the aortic valve remains closed.

Indicate whether ventricular volume, ventricular pressure, and aortic pressure are increasing, decreasing, or remain unchanged during Ventricular Filling.

ventricular volume: increase ventricular pressure: increase aortic pressure: decrease

Indicate whether ventricular volume and ventricular pressure are increasing, decreasing, or remain unchanged during Isovolumetric Relaxation.

ventricular volume: no change ventricular pressure: decrease

Indicate whether ventricular volume, ventricular pressure, and aortic pressure are increasing, decreasing, or remain unchanged during Isovolumetric Contraction.When you are happy with your choices, click Submit to check your answer.

ventricular volume: no change ventricular pressure: increase aortic pressure: decrease