Pregunta
Part A
The beginning of the QRS complex of the electrocardiogram (ECG) immediately precedes which of the following event
View Available Hint(s)
closing of the atrioventricular valves
blood ejection from the ventricles
atrial contraction
closing of the semilunar valves
The beginning of the QRS complex of the electrocardiogram (ECG) immediately precedes which of the following event
View Available Hint(s)
closing of the atrioventricular valves
blood ejection from the ventricles
atrial contraction
closing of the semilunar valves
Ask by French Reed. in the United States
Jan 22,2025
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The beginning of the QRS complex on an ECG immediately precedes blood ejection from the ventricles.
Solución
The beginning of the QRS complex on an electrocardiogram (ECG) represents ventricular depolarization, which triggers the ventricular contraction phase of the cardiac cycle. This contraction leads to the ejection of blood from the ventricles into the aorta and pulmonary artery.
Correct Answer:
- Blood ejection from the ventricles
Explanation:
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Closing of the atrioventricular valves: This event occurs shortly after ventricular contraction begins, preventing backflow into the atria, and is associated with the first heart sound (S1). However, it is not immediately preceded by the QRS complex.
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Blood ejection from the ventricles: This is directly initiated by the ventricular contraction that follows ventricular depolarization (QRS complex), making it the event immediately preceded by the QRS complex.
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Atrial contraction: This occurs before the QRS complex during the P wave and is not related to the events immediately following the QRS complex.
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Closing of the semilunar valves: This happens after the ventricles begin to relax (repolarization), which is later in the cardiac cycle and not immediately after the QRS complex.
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Simplifique esta solución Mind Expander
The QRS complex of the ECG represents the depolarization of the ventricles, which leads to the contraction of the heart muscle. Specifically, this electrical signal triggers the ventricles to contract and pump blood out into the arteries. Thus, right after the QRS complex, blood is ejected from the ventricles, ensuring vital circulation throughout the body.
Interestingly, the timing of these events is critical for maintaining efficient heart function. If there’s a delay or blockage in the conduction system, it can lead to arrhythmias or other cardiac issues. This is why healthcare providers closely monitor the ECG, as it gives us vital clues about heart health and rhythm!
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