Podcast
Questions and Answers
What are the three variables that may influence stroke volume?
What are the three variables that may influence stroke volume?
- Venous return, presence of inotropic agents, and afterload (correct)
- End-diastolic volume, end-systolic volume, and preload
- Venous return, presence of inotropic agents, and preload
- Venous return, end-diastolic volume, and end-systolic volume
What is the typical end-diastolic volume (EDV) in a resting adult?
What is the typical end-diastolic volume (EDV) in a resting adult?
- 150 mL
- 130 mL (correct)
- 60 mL
- 100 mL
What is the typical end-systolic volume (ESV) in a resting adult?
What is the typical end-systolic volume (ESV) in a resting adult?
- 30 mL
- 75 mL
- 45 mL
- 60 mL (correct)
What is the formula for calculating stroke volume?
What is the formula for calculating stroke volume?
Which of the following is NOT a factor that influences end-diastolic volume (EDV)?
Which of the following is NOT a factor that influences end-diastolic volume (EDV)?
How does end-systolic volume (ESV) affect stroke volume?
How does end-systolic volume (ESV) affect stroke volume?
What initiates cardiac muscle contraction?
What initiates cardiac muscle contraction?
What is the role of ATP in cardiac muscle contraction?
What is the role of ATP in cardiac muscle contraction?
What is the role of the sarcoplasmic reticulum in cardiac muscle relaxation?
What is the role of the sarcoplasmic reticulum in cardiac muscle relaxation?
What happens during the powerstroke in cardiac muscle contraction?
What happens during the powerstroke in cardiac muscle contraction?
What is the role of plasma membrane calcium pumps in cardiac muscle relaxation?
What is the role of plasma membrane calcium pumps in cardiac muscle relaxation?
What happens to the sarcomeres during cardiac muscle relaxation?
What happens to the sarcomeres during cardiac muscle relaxation?
Which of the following statements is true about ventricular balance?
Which of the following statements is true about ventricular balance?
Why is the left ventricle larger and stronger than the right ventricle?
Why is the left ventricle larger and stronger than the right ventricle?
What condition can result from sustained pumping of unequal amounts of blood by the ventricles?
What condition can result from sustained pumping of unequal amounts of blood by the ventricles?
What is the analogy used to explain the difference in work required by the left and right ventricles?
What is the analogy used to explain the difference in work required by the left and right ventricles?
Which of the following is true about the pressure within the left atrium, left ventricle, and aorta during the cardiac cycle?
Which of the following is true about the pressure within the left atrium, left ventricle, and aorta during the cardiac cycle?
What information is provided in Figure 19.24?
What information is provided in Figure 19.24?
What happens to the overlap of thick and thin filaments in cardiac muscle cells during a more forceful ventricular contraction?
What happens to the overlap of thick and thin filaments in cardiac muscle cells during a more forceful ventricular contraction?
How does a decrease in venous return affect the formation of crossbridges in cardiac muscle cells?
How does a decrease in venous return affect the formation of crossbridges in cardiac muscle cells?
What causes venous return to increase according to the text?
What causes venous return to increase according to the text?
How does a decrease in venous return affect ventricular contraction strength?
How does a decrease in venous return affect ventricular contraction strength?
What analogy is provided in the text to explain venous return?
What analogy is provided in the text to explain venous return?
Why does venous return increase during exercise according to the text?
Why does venous return increase during exercise according to the text?
What causes the semilunar valves to close during the cardiac cycle?
What causes the semilunar valves to close during the cardiac cycle?
Why do the AV valves remain closed during the phase when the semilunar valves are closed?
Why do the AV valves remain closed during the phase when the semilunar valves are closed?
What happens to the blood volume within the ventricular chambers during the phase when all heart valves are closed?
What happens to the blood volume within the ventricular chambers during the phase when all heart valves are closed?
What causes the AV valves to open during the cardiac cycle?
What causes the AV valves to open during the cardiac cycle?
What is the purpose of the opening of the AV valves during the cardiac cycle?
What is the purpose of the opening of the AV valves during the cardiac cycle?
What is the significance of the cardiac cycle being repeated with each heartbeat?
What is the significance of the cardiac cycle being repeated with each heartbeat?
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