Podcast
Questions and Answers
What is the overall aim of the cardiac cycle?
What is the overall aim of the cardiac cycle?
- To regulate electrical signals in the heart
- To integrate electrical activity, contraction, and blood flow in the heart (correct)
- To generate force and pump blood
- To monitor blood pressure
During which phase of the cardiac cycle do the ventricles contract?
During which phase of the cardiac cycle do the ventricles contract?
- Ventricular diastole
- Late diastole
- Early diastole
- Atrial systole (correct)
What is the primary function of the heart according to the text?
What is the primary function of the heart according to the text?
- To monitor electrical signals in the heart
- To generate force for circulation (correct)
- To regulate blood pressure
- To relax the ventricles during diastole
Which chamber of the heart fills passively during late diastole?
Which chamber of the heart fills passively during late diastole?
What is the normal range for heart rate when analyzing an ECG?
What is the normal range for heart rate when analyzing an ECG?
What does the presence of one QRS complex for each P wave indicate in ECG analysis?
What does the presence of one QRS complex for each P wave indicate in ECG analysis?
If there is not one QRS complex for each P wave in ECG analysis, what additional step is recommended?
If there is not one QRS complex for each P wave in ECG analysis, what additional step is recommended?
What does a wide QRS complex indicate in ECG analysis?
What does a wide QRS complex indicate in ECG analysis?
What is the function of the AV node in the heart's conducting system?
What is the function of the AV node in the heart's conducting system?
Why is there an inert fibrous tissue barrier between the atrial and ventricular myocyte syncytia?
Why is there an inert fibrous tissue barrier between the atrial and ventricular myocyte syncytia?
Which part of the heart's conducting system can act as a pacemaker under some conditions?
Which part of the heart's conducting system can act as a pacemaker under some conditions?
How does parasympathetic activity affect heart rate?
How does parasympathetic activity affect heart rate?
During which phase of the cardiac cycle does the pressure in the ventricles fall and blood flows back into the cusps of the semilunar valves?
During which phase of the cardiac cycle does the pressure in the ventricles fall and blood flows back into the cusps of the semilunar valves?
What event forces a small amount of additional blood into the ventricles during the cardiac cycle?
What event forces a small amount of additional blood into the ventricles during the cardiac cycle?
At what point in the cardiac cycle does the pressure in the ventricles exceed the pressure in the arteries, causing the semilunar valves to open and blood to be ejected?
At what point in the cardiac cycle does the pressure in the ventricles exceed the pressure in the arteries, causing the semilunar valves to open and blood to be ejected?
Which phase of ventricular contraction pushes the atrioventricular (AV) valves closed but does not create enough pressure to open the semilunar valves?
Which phase of ventricular contraction pushes the atrioventricular (AV) valves closed but does not create enough pressure to open the semilunar valves?
In the Wiggers diagram, which point corresponds to the dicrotic notch?
In the Wiggers diagram, which point corresponds to the dicrotic notch?
What event is represented by the QRS complex on an electrocardiogram (ECG) in the Wiggers diagram?
What event is represented by the QRS complex on an electrocardiogram (ECG) in the Wiggers diagram?
