The Cardiac Cycle Quiz

Cardiac Cycle and ECG

• The Bundle of His is responsible for the depolarization of the ventricles.
• The outermost layer of the heart wall is called the epicardium.
• The innermost lining of the heart muscle is called the endocardium.
• The formula for calculating cardiac output is Cardiac Output = Heart Rate x Stroke Volume.
• The mechanical factor that affects stroke volume is preload.
• The P wave on an ECG represents atrial depolarization.
• The QRS complex on an ECG represents ventricular depolarization.
• The T wave on an ECG represents ventricular repolarization.
• The interval measured from the start of the P wave to the start of the Q wave on an ECG is called the PR interval.
• The interval measured from the end of the S wave to the start of the T wave on an ECG is called the ST segment.

Phases of the Cardiac Cycle

• During the atrial contraction phase, the atria contract and push blood out of the atria and into the ventricles.
• The purpose of the Isovolumetric Ventricular Contraction phase is to allow the ventricles to contract and build pressure without changing volume.
• The SL valves open during the rapid ejection phase.
• Residual volume in the context of the cardiac cycle is the volume of blood left in the ventricles after systole.
• The closure of the SL valves during the cardiac cycle is caused by the increase in ventricular pressure.
• The phase of the cardiac cycle that occurs between the closure of the SL valves and the re-opening of the AV valves is the isovolumetric relaxation phase.
• The purpose of measuring blood flow, pressure changes, and blood volume throughout the cardiac cycle is to understand the cardiac function and identify any abnormalities.

Cardiac Cycle Events

• The onset of ventricular systole during the cardiac cycle is marked by the QRS complex.
• A complete heartbeat or pumping cycle is called a cardiac cycle.
• The cardiac cycle is broken down into 8 phases or steps.

Test your knowledge of the cardiac cycle with this quiz! Explore the different stages of contraction and relaxation in the heart and learn about measuring blood flow, pressure changes, and blood volume.