Cardiac Function and Regulation Quiz

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Which of the following factors has the most direct and proportionate effect on myocardial oxygen consumption (MVO2)?

Afterload

Preload

Inotropy (correct)

Heart rate

If heart rate increases by 50%, what is the expected change in myocardial oxygen consumption (MVO2)?

MVO2 increases by 25%

MVO2 increases by 75%

MVO2 increases by 100%

MVO2 increases by 50% (correct)

Which of the following is NOT a factor that affects myocardial oxygen consumption (MVO2)?

Ventricular diastolic pressure

Contractility

Coronary blood flow (correct)

Ventricular wall tension

If afterload increases, what is the expected change in myocardial oxygen consumption (MVO2)?

MVO2 increases proportionately Signup and view all the answers

If preload increases, what is the expected change in myocardial oxygen consumption (MVO2)?

MVO2 increases slightly Signup and view all the answers

What is the relationship between inotropy and ejection fraction (EF) according to the text?

Inotropy and EF are directly related Signup and view all the answers

Which type of heart failure is characterized by a reduced ejection fraction?

Heart failure with reduced ejection fraction Signup and view all the answers

What is the role of the sympathetic nervous system in regulating inotropy?

The sympathetic nervous system directly increases inotropy Signup and view all the answers

How does calcium regulation affect inotropy?

Increased intracellular calcium concentration directly increases inotropy Signup and view all the answers

Which of the following graphs would best represent the relationship between cardiac output and ejection fraction?

A linear, positive correlation Signup and view all the answers

What is the primary mechanism by which the sympathetic nervous system increases cardiac output?

Increasing stroke volume (inotropy) Signup and view all the answers

Which of the following statements about the Frank-Starling mechanism is correct?

It is a positive feedback mechanism that increases cardiac output when venous return increases Signup and view all the answers

Which of the following changes would cause a decrease in the slope of the cardiac output curve?

Decreased heart rate Signup and view all the answers

What is the primary mechanism by which calcium ions $\text{(Ca}^{2+}\text{)}$ increase cardiac contractility?

Increasing the binding of calcium to troponin C Signup and view all the answers

Which of the following statements about the cardiac cycle is correct?

Atrial systole occurs during ventricular systole Signup and view all the answers

Cardiac Function and Regulation Quiz

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Questions and Answers

Which of the following factors has the most direct and proportionate effect on myocardial oxygen consumption (MVO2)?

If heart rate increases by 50%, what is the expected change in myocardial oxygen consumption (MVO2)?

Which of the following is NOT a factor that affects myocardial oxygen consumption (MVO2)?

If afterload increases, what is the expected change in myocardial oxygen consumption (MVO2)?

If preload increases, what is the expected change in myocardial oxygen consumption (MVO2)?

What is the relationship between inotropy and ejection fraction (EF) according to the text?

Which type of heart failure is characterized by a reduced ejection fraction?

What is the role of the sympathetic nervous system in regulating inotropy?

How does calcium regulation affect inotropy?

Which of the following graphs would best represent the relationship between cardiac output and ejection fraction?

What is the primary mechanism by which the sympathetic nervous system increases cardiac output?

Which of the following statements about the Frank-Starling mechanism is correct?

Which of the following changes would cause a decrease in the slope of the cardiac output curve?

What is the primary mechanism by which calcium ions $\text{(Ca}^{2+}\text{)}$ increase cardiac contractility?

Which of the following statements about the cardiac cycle is correct?

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