CVN 831 Graded QUIZ 25 Questions

During the ventricular systole phase of the cardiac cycle, what causes the first heart sound (S1)?

• Opening of the semilunar valves

• Closing of the AV valves

• Closing of the semilunar valves

• Opening of the AV valves

Which of the following components is primarily responsible for setting the pace of the heart's electrical activity?

• AV Node

• Purkinje Fibers

• Bundle of His

• SA Node

What is the formula for calculating cardiac output (CO)?

• CO = Heart Rate × Blood Pressure

• CO = Stroke Volume × Heart Rate

• CO = Stroke Volume × Blood Pressure

• CO = Stroke Volume / Heart Rate

What term describes the amount of blood remaining in a ventricle after it has contracted?

• End Diastolic Volume (EDV)

• Stroke Volume (SV)

• Cardiac Output (CO)

• End Systolic Volume (ESV)

According to the Frank-Starling law, which factor most directly influences stroke volume?

• Afterload

• Contractility

• Preload

• Heart Rate

What does the T-wave on an electrocardiogram (ECG) represent?

• Atrial depolarization

• Ventricular depolarization

• Ventricular repolarization

• Atrial repolarization

Which of the following factors can increase cardiac output?

• Decreased heart rate

• Increased stroke volume

• Decreased preload

• Increased afterload

The QRS complex in an ECG corresponds to which event in the cardiac cycle?

• Atrial contraction

• Ventricular depolarization

• Ventricular relaxation

• Atrial repolarization

Which of the following conditions would likely decrease stroke volume?

• Increased preload

• Increased afterload

• Increased contractility

• Increased venous return

What is the primary function of the SA node in the heart?

• Delay the electrical impulse

• Act as a secondary pacemaker

• Initiate the heartbeat

• Constrict the blood vessels