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12 Questions

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Cardiac Cycle and Cardiac Output

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Questions and Answers

During which phase of the cardiac cycle does the heart muscle relax and fill with blood?

Ventricular relaxation

Atrial contraction

Systole

Diastole (correct)

What is the relationship between blood pressure (BP), cardiac output (CO), and peripheral resistance (PR)?

BP is directly proportional to CO and inversely proportional to PR (correct)

BP is inversely proportional to CO and PR

BP is inversely proportional to CO but directly proportional to PR

BP is directly proportional to CO but not affected by PR

What is the normal range of heartbeats per minute in adults?

40-70 beats per minute

60-100 beats per minute (correct)

80-120 beats per minute

100-140 beats per minute

What is the volume of blood pumped from one ventricle of the heart with each beat called?

Stroke volume Signup and view all the answers

Which event in the cardiac cycle marks the closure of semilunar valves, producing the second heart sound (S2)?

Ventricular contraction Signup and view all the answers

What term is used to describe abnormal heart sounds due to turbulent blood flow?

Murmurs Signup and view all the answers

What is responsible for the differences in action potential duration and plateau phase in cardiac muscle?

Calcium ions Signup and view all the answers

Why do atria contract before ventricular contraction in the heart's pumping cycle?

To fill ventricles before ventricular contraction Signup and view all the answers

Which of the following drugs decreases heart rate?

Pilocarpine Signup and view all the answers

How do chronotropic drugs differ from inotropic drugs in their effects on the heart?

Chronotropic drugs affect heart rate, while inotropic drugs affect contractility. Signup and view all the answers

During which phase of the cardiac cycle does the heart experience its highest pressure?

Ventricular systole Signup and view all the answers

What initiates the closing of AV valves during the heart's pumping cycle?

Ventricular pressure Signup and view all the answers