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Intrinsic Conduction System, Exams of Physiology

University of Washington (UW) - SeattlePhysiology

To recognize that the intrinsic conduction system coordinates heart activity by determining the direction and speed of heart depolarization.

Typology: Exams

2022/2023

Uploaded on 03/01/2023

sureesh
sureesh 🇺🇸

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ADAM Interactive Physiology
Intrinsic Conduction System
Goals
• To identify the components of the intrinsic conduction system.
• To recognize that the intrinsic conduction system coordinates heart activity by determining the
direction and speed of heart depolarization.
• To relate heart electrical activity to an ECG wave tracing.
1. (Page 3) Label this diagram:
2. (Page 1.) What is the purpose of the intrinsic conduction system of the heart?
3. (Page 1.) What type of cells are present in the intrinsic conduction system of the heart?
4. (Page 3.) List the six areas within the heart where autorhythmic cells are found.
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ADAM Interactive Physiology

Intrinsic Conduction System

Goals

  • To identify the components of the intrinsic conduction system.
  • To recognize that the intrinsic conduction system coordinates heart activity by determining the direction and speed of heart depolarization.
  • To relate heart electrical activity to an ECG wave tracing.
  1. (Page 3) Label this diagram:
  2. (Page 1.) What is the purpose of the intrinsic conduction system of the heart?
  3. (Page 1.) What type of cells are present in the intrinsic conduction system of the heart?
  4. (Page 3.) List the six areas within the heart where autorhythmic cells are found.
  1. (Page 4.) Match the six areas within the heart where autorhythmic cells are found to their location within the heart. Location Within the Heart: ____ Interatrial septum to the interventricular septum. ____ Lower interventricular septum to the myocardium of the ventricles. ____ Inferior interatrial septum. ____ Upper right atrium. ____ Throughout the walls of the atria. ____ Within the interventricular septum.

Areas Where Autorhythmic Cells Are Found: a. Internodal Pathway b. AV Node c. Bundle Branches d. SA Node e. Purkinje Fibers f. AV Bundle

  1. (Page 4.) Match the six areas within the heart where autorhythmic cells are found to their function. Functions: ____ Initiates the depolarization impulse that generates an action potential, setting the overall pace of the heartbeat. ____ Convey the action potential to the contractile cells of the ventricle. ____ Delays the action potential while the atria contract. ____ Links the SA node to the AV node, distributing the action potential to the contractile cells of the atria. ____ Electrically connects the atria and the ventricles, connecting the AV node to the Bundle Branches. ____ Conveys the action potential down the interventricular septum.

Areas Where Autorhythmic Cells Are Found: a. Internodal Pathway b. AV Node c. Bundle Branches d. SA Node e. Purkinje Fibers f. AV Bundle

  1. (Page 4.) Explain the difference between the electrical and mechanical events which occur within the heart, and explain the cell types that carry out each. Which occurs first, the electrical or mechanical events?
  2. (Page 5.) In an ECG tracing, how are the following represented: Heart Action ____ atrial depolarization. ____ atrial repolarization ____ ventricular depolarization ____ ventricular repolarization

ECG Tracing a. P wave b. QRS Complex c. T wave d. Not visible

  1. (Page 6.) a. The P wave indicates the electrical event of atrial depolarization. What mechanical event follows the P wave? b. The QRS complex indicates the electrical event of ventricular depolarization. What mechanical event follows the QRS complex? c. The T wave indicates the electrical event of ventricular repolarization. What mechanical event follows the T wave?