Conducting System of the Heart Quiz

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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?

Ventricular diastole

Late diastole

Early diastole

Atrial systole (correct)

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?

Right atrium Signup and view all the answers

What is the normal range for heart rate when analyzing an ECG?

60-100 beats per minute Signup and view all the answers

What does the presence of one QRS complex for each P wave indicate in ECG analysis?

Normal rhythm Signup and view all the answers

If there is not one QRS complex for each P wave in ECG analysis, what additional step is recommended?

Counting the heart rate using the P waves then count it according to the R waves Signup and view all the answers

What does a wide QRS complex indicate in ECG analysis?

Ventricular depolarization Signup and view all the answers

What is the function of the AV node in the heart's conducting system?

Delays the transmission of action potentials Signup and view all the answers

Why is there an inert fibrous tissue barrier between the atrial and ventricular myocyte syncytia?

To prevent the spread of depolarization between atria and ventricles Signup and view all the answers

Which part of the heart's conducting system can act as a pacemaker under some conditions?

Purkinje fibers Signup and view all the answers

How does parasympathetic activity affect heart rate?

Lowers heart rate by activating the vagus nerve that innervates the SA node Signup and view all the answers

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?

Isovolumic ventricular relaxation Signup and view all the answers

What event forces a small amount of additional blood into the ventricles during the cardiac cycle?

Atrial systole Signup and view all the answers

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?

Ventricular ejection Signup and view all the answers

Which phase of ventricular contraction pushes the atrioventricular (AV) valves closed but does not create enough pressure to open the semilunar valves?

Isovolumic ventricular contraction Signup and view all the answers

In the Wiggers diagram, which point corresponds to the dicrotic notch?

B Signup and view all the answers

What event is represented by the QRS complex on an electrocardiogram (ECG) in the Wiggers diagram?

Ventricular contraction Signup and view all the answers