Textbook Question
Draw a normal ECG pattern. Label and explain the significance of its deflection waves.
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18. The Heart
Electrocardiogram (ECG)
Problem 13d
Textbook Question
Mark the following statements as true or false. If a statement is false, correct it to make a true statement.
The ventricular ejection phase generally correlates with the S-T segment and the T wave on the ECG.
Verified step by step guidance1
Step 1: Understand the ventricular ejection phase in the cardiac cycle. This phase occurs when the ventricles contract and eject blood into the arteries (aorta and pulmonary artery). It corresponds to the period of systole in the heart.
Step 2: Review the components of an ECG (electrocardiogram). The S-T segment represents the plateau phase of ventricular depolarization, while the T wave represents ventricular repolarization.
Step 3: Analyze the correlation between the ventricular ejection phase and the ECG. The ventricular ejection phase typically begins during the S-T segment, as the ventricles are fully depolarized and contracting, and continues into the T wave as repolarization begins.
Step 4: Determine the truth of the statement. Based on the physiological correlation, the statement is true because the ventricular ejection phase aligns with the S-T segment and the T wave on the ECG.
Step 5: If the statement were false, the correction would involve identifying the correct ECG components that align with the ventricular ejection phase. However, in this case, no correction is needed as the statement is accurate.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Ventricular Ejection Phase
The ventricular ejection phase is part of the cardiac cycle where the ventricles contract and pump blood into the aorta and pulmonary artery. This phase occurs after the isovolumetric contraction and is crucial for maintaining blood circulation. It is typically associated with the peak of ventricular pressure and is reflected in the heart's mechanical activity.
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ECG Segments and Waves
An electrocardiogram (ECG) records the electrical activity of the heart, displaying various segments and waves. The S-T segment represents the period between ventricular depolarization and repolarization, while the T wave indicates ventricular repolarization. Understanding these components is essential for correlating electrical events with mechanical heart functions.
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Cardiac Cycle Phases
The cardiac cycle consists of a series of phases that include diastole and systole, which encompass the filling and ejection of blood from the heart. Each phase is characterized by specific electrical and mechanical events, and understanding these phases helps in interpreting the relationship between ECG readings and heart function, particularly during ventricular contraction.
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