Cardiac Cycle Quiz

Which coronary artery supplies the right atrium and both ventricles?

• A. Left coronary artery

• B. Right coronary artery

• C. Circumflex artery

• D. Anterior interventricular artery

What is the sequence of layers in the heart wall starting from the outermost layer?

• A. Epicardium, Myocardium, Endocardium

• B. Myocardium, Epicardium, Endocardium

• C. Endocardium, Epicardium, Myocardium

• D. Pericardium, Myocardium, Endocardium

Which layer of the heart is responsible for contraction and contains intercalated discs?

• A. Epicardium

• B. Myocardium

• C. Endocardium

• D. Pericardium

What is the primary role of the fibrous tissue within the pericardium?

• A. To conduct electrical impulses

• B. To anchor the heart within the mediastinum

• C. To prevent backflow of blood

• D. To facilitate rapid contraction of the heart

During atrial systole, which of the following accurately describes the status of the heart valves?

• A. AV valves open, Semilunar valves open

• B. AV valves closed, Semilunar valves open

• C. AV valves open, Semilunar valves closed

• D. AV valves closed, Semilunar valves closed

The S1 heart sound corresponds with which event in the cardiac cycle?

• A. Closure of the aortic and pulmonic valves

• B. Opening of the AV valves

• C. Closure of the mitral and tricuspid valves

• D. Opening of the semilunar valves

What happens to the semilunar valves during ventricular systole?

• A. They remain closed

• B. They open when ventricular pressure exceeds arterial pressure

• C. They open when ventricular pressure exceeds pulmonary artery pressure

• D. They close as soon as ventricular contraction begins

What does the P wave on an ECG represent?

• A. Depolarization of the atria

• B. Depolarization of the ventricles

• C. Repolarization of the ventricles

• D. Activation of the SA node

Which phase of the cardiac cycle involves all valves being closed while the ventricles maintain a high pressure without changing volume?

• A. Atrial systole

• B. Ventricular systole

• C. Isometric relaxation

• D. Atrial diastole

During the pathway of blood through the heart and systemic circulation, where does blood flow immediately after the left ventricle?

• A. Pulmonary artery

• B. Aorta

• C. Right atrium

• D. Left atrium