Podcast
Questions and Answers
Which of the following statements correctly identifies the relationship between the P wave and atrial systole on an EKG?
Which of the following statements correctly identifies the relationship between the P wave and atrial systole on an EKG?
- The P wave precedes atrial systole and represents the electrical activity associated with atrial contraction. (correct)
- The P wave directly coincides with atrial systole, representing the electrical depolarization of the atria.
- Atrial systole is represented by the T wave, while the P wave reflects the electrical activity of ventricular depolarization.
- Atrial systole occurs during the QRS complex, and the P wave represents the relaxation of the atria.
During which phase of the cardiac cycle are both the atrioventricular (AV) valve and the semilunar (SL) valves closed?
During which phase of the cardiac cycle are both the atrioventricular (AV) valve and the semilunar (SL) valves closed?
- Ventricular systole (correct)
- Atrial systole
- Ventricular diastole (late)
- Ventricular diastole (early)
Which of the following statements accurately describes the relationship between ventricular pressure and the closure of the semilunar valve?
Which of the following statements accurately describes the relationship between ventricular pressure and the closure of the semilunar valve?
- The SL valve closes when the pressure in the ventricle exceeds the pressure in the aorta/pulmonary trunk.
- The SL valve closes when the pressure in the ventricle becomes equal to the pressure in the aorta/pulmonary trunk.
- The SL valve closes when the pressure in the ventricle decreases below the pressure in the aorta/pulmonary trunk. (correct)
- The SL valve closes when the pressure in the ventricle falls below the pressure in the atria.
Which of the following electrical events on the EKG corresponds to the period of ventricular relaxation?
Which of the following electrical events on the EKG corresponds to the period of ventricular relaxation?
During which phase of the cardiac cycle does the volume of the ventricle increase as the atria contract?
During which phase of the cardiac cycle does the volume of the ventricle increase as the atria contract?
What is the primary function of the atrioventricular (AV) valve during ventricular diastole?
What is the primary function of the atrioventricular (AV) valve during ventricular diastole?
Which of the following heart sounds coincides with the closure of the semilunar valves during ventricular diastole?
Which of the following heart sounds coincides with the closure of the semilunar valves during ventricular diastole?
What is the primary electrical event occurring during the QRS complex on an EKG?
What is the primary electrical event occurring during the QRS complex on an EKG?
Flashcards
P Wave
P Wave
Represents Atrial Depolarization on an EKG.
QRS Segment
QRS Segment
Represents Ventricular Depolarization; Atrial Repolarization is hidden.
T Wave
T Wave
Represents Ventricular Repolarization on an EKG.
Diastole
Diastole
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Systole
Systole
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Atrial Diastole
Atrial Diastole
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Atrial Systole
Atrial Systole
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Ventricular Diastole
Ventricular Diastole
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Study Notes
EKG Tracing Key Events
- The P wave represents atrial depolarization.
- The QRS complex represents ventricular depolarization (and hidden atrial repolarization).
- The T wave represents ventricular repolarization.
Cardiac Cycle Periods
-
Atrial Diastole (Relaxation):
- Atrial volume increases, reducing pressure.
- Ventricular volume and pressure remain unchanged.
- Atrioventricular (AV) valves are closed.
- Semilunar (SL) valves are closed.
- No heart sound is associated.
- Atrial relaxation occurs during part of ventricular systole on an EKG.
-
Atrial Systole (Contraction):
- Atrial volume decreases, increasing pressure.
- Pressure in the atria surpasses ventricular pressure, opening AV valves.
- Ventricles are relaxed.
- Blood flows from atria to ventricles.
- No heart sound is associated.
- This event is represented by the P wave on an EKG.
-
Ventricular Diastole (Relaxation):
- Ventricular volume increases, decreasing pressure.
- Ventricular pressure falls below aortic/pulmonary trunk pressure, closing SL valves.
- This "closing" of the SL valves creates the second heart sound (S2).
- The T wave on the EKG marks this event.
- AV valves are closed because atrial pressure remains below ventricular pressure except at the very end where pressure in atria becomes greater than in ventricles opening the AV valves.
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