Podcast
Questions and Answers
During which phase of the cardiac cycle does the heart muscle relax and fill with blood?
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)?
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?
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?
What is the volume of blood pumped from one ventricle of the heart with each beat called?
Which event in the cardiac cycle marks the closure of semilunar valves, producing the second heart sound (S2)?
Which event in the cardiac cycle marks the closure of semilunar valves, producing the second heart sound (S2)?
What term is used to describe abnormal heart sounds due to turbulent blood flow?
What term is used to describe abnormal heart sounds due to turbulent blood flow?
What is responsible for the differences in action potential duration and plateau phase in cardiac muscle?
What is responsible for the differences in action potential duration and plateau phase in cardiac muscle?
Why do atria contract before ventricular contraction in the heart's pumping cycle?
Why do atria contract before ventricular contraction in the heart's pumping cycle?
Which of the following drugs decreases heart rate?
Which of the following drugs decreases heart rate?
How do chronotropic drugs differ from inotropic drugs in their effects on the heart?
How do chronotropic drugs differ from inotropic drugs in their effects on the heart?
During which phase of the cardiac cycle does the heart experience its highest pressure?
During which phase of the cardiac cycle does the heart experience its highest pressure?
What initiates the closing of AV valves during the heart's pumping cycle?
What initiates the closing of AV valves during the heart's pumping cycle?
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