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Millivolts Q P wave PR interval R 5 mm S - T wave QT interval 1 s P-R segment R S-T segment QRS complex Figure 1. Electrocardiogram (ECG) Question 1. Describe the events happening during: 1. P wave, 2.QRS complex, 3. T wave, 4. P-R interval, 5. Q-T interval, 6. End of T to following R 1: 2: 3: 4: 5:

Millivolts Q P wave PR interval R 5 mm S - T wave QT interval 1 s P-R segment R S-T segment QRS complex Figure 1. Electrocardiogram (ECG) Question 1. Describe the events happening during: 1. P wave, 2.QRS complex, 3. T wave, 4. P-R interval, 5. Q-T interval, 6. End of T to following R 1: 2: 3: 4: 5:

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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### Educational Resource: Understanding the Electrocardiogram (ECG) #### Figure 1. Electrocardiogram (ECG) **Question 1:** Describe the events happening during: 1. **P wave** 2. **QRS complex** 3. **T wave** 4. **P-R interval** 5. **Q-T interval** 6. **End of T to following R** #### Explanation: The figure illustrates an Electrocardiogram (ECG) tracing, with a detailed breakdown of the various segments and intervals marked. This guide will help you understand the specific components of a heart's electrical activity as recorded by an ECG. **Overview:** - The upper part of the diagram shows a standard ECG recording over a 1-second period with a calibration signal indicating 5 mm. - The lower part zooms in on a single cardiac cycle, labeling important features. **Labels and Components:** 1. **P Wave:** - **Label:** The first small upward deflection. - **Description:** Represents atrial depolarization, which initiates atrial contraction. 2. **QRS Complex:** - **Label:** The combination of three deflections – Q wave (downward), R wave (sharp upward), and S wave (downward following the R wave). - **Description:** Corresponds to ventricular depolarization, which triggers ventricular contraction. 3. **T Wave:** - **Label:** A broad upward deflection following the QRS complex. - **Description:** Reflects ventricular repolarization, as the ventricles recover from contraction. 4. **P-R Interval:** - **Label:** The period from the beginning of the P wave to the start of the QRS complex. - **Description:** Indicates the time between the onset of atrial depolarization and the onset of ventricular depolarization, representing the delay at the AV node. 5. **Q-T Interval:** - **Label:** The period from the start of the Q wave to the end of the T wave. - **Description:** Represents the total time for ventricular depolarization and repolarization. 6. **End of T to Following R:** - **Label:** The period from the end of the T wave to the next R wave (start of the next QRS complex). - **Description:** Often referred to as the isoelectric period, where the heart is at
Transcribed Image Text:### Educational Resource: Understanding the Electrocardiogram (ECG) #### Figure 1. Electrocardiogram (ECG) **Question 1:** Describe the events happening during: 1. **P wave** 2. **QRS complex** 3. **T wave** 4. **P-R interval** 5. **Q-T interval** 6. **End of T to following R** #### Explanation: The figure illustrates an Electrocardiogram (ECG) tracing, with a detailed breakdown of the various segments and intervals marked. This guide will help you understand the specific components of a heart's electrical activity as recorded by an ECG. **Overview:** - The upper part of the diagram shows a standard ECG recording over a 1-second period with a calibration signal indicating 5 mm. - The lower part zooms in on a single cardiac cycle, labeling important features. **Labels and Components:** 1. **P Wave:** - **Label:** The first small upward deflection. - **Description:** Represents atrial depolarization, which initiates atrial contraction. 2. **QRS Complex:** - **Label:** The combination of three deflections – Q wave (downward), R wave (sharp upward), and S wave (downward following the R wave). - **Description:** Corresponds to ventricular depolarization, which triggers ventricular contraction. 3. **T Wave:** - **Label:** A broad upward deflection following the QRS complex. - **Description:** Reflects ventricular repolarization, as the ventricles recover from contraction. 4. **P-R Interval:** - **Label:** The period from the beginning of the P wave to the start of the QRS complex. - **Description:** Indicates the time between the onset of atrial depolarization and the onset of ventricular depolarization, representing the delay at the AV node. 5. **Q-T Interval:** - **Label:** The period from the start of the Q wave to the end of the T wave. - **Description:** Represents the total time for ventricular depolarization and repolarization. 6. **End of T to Following R:** - **Label:** The period from the end of the T wave to the next R wave (start of the next QRS complex). - **Description:** Often referred to as the isoelectric period, where the heart is at
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