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Cardiovascular System and Its Functions

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Questions and Answers

Which of the following is the primary function of the cardiovascular system?

To maintain acid-base balance

To regulate immune function

To deliver oxygen and nutrients, and remove carbon dioxide and waste (correct)

To transport hormones and other molecules

What is the role of the AV node in the cardiac conduction system?

It initiates the contraction signal

It spreads the electrical signal throughout the ventricles

It relays the signal to the ventricles after a delay (correct)

It generates the intrinsic heart rate of 100 beats per minute

How does endurance training affect resting heart rate?

It decreases resting heart rate (correct)

It increases resting heart rate only in elite endurance athletes

It has no effect on resting heart rate

It increases resting heart rate

Which of the following is a type of cardiac arrhythmia?

All of the above Signup and view all the answers

What is the purpose of the ECG (electrocardiogram) recording?

To record the heart's electrical activity Signup and view all the answers

What is the role of the sympathetic nervous system in the control of heart activity?

It increases heart rate and force of contraction Signup and view all the answers

What is the role of the parasympathetic nervous system in the control of heart activity?

It decreases heart rate and force of contraction Signup and view all the answers

What is the cause of ventricular fibrillation?

Abnormal electrical activity in the ventricles Signup and view all the answers

What is the function of the cardiac conduction system?

To spread the electrical signal throughout the heart Signup and view all the answers

What is the role of the SA node in the cardiac conduction system?

It initiates the contraction signal Signup and view all the answers

What term refers to the volume of blood pumped in one heartbeat?

Stroke volume Signup and view all the answers

During which phase of the cardiac cycle do the atrioventricular valves close and the semilunar valves open?

Ventricular systole Signup and view all the answers

What is the term used to describe three or more consecutive premature ventricular contractions that compromise pumping capacity?

Ventricular tachycardia Signup and view all the answers

Which event occurs during the Diastole phase of the cardiac cycle?

Chambers fill with blood Signup and view all the answers

Ejection fraction is calculated as:

(End-systolic volume / End-diastolic volume) * 100 Signup and view all the answers

Ventricular fibrillation results in:

Little to no blood being pumped out of the heart Signup and view all the answers