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NUR 1211 Week 3 Lesson Basic ECG Interpretation/ International College of Health Sciences

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NUR 1211 Week 3 Lesson Basic ECG Interpretation/ International College of Health Sciences.Question 1 of 14 Which statement describes the role of the Purkinje fibers in the pathway of the normal card... iac cycle? • o Origination of normal impulses The SA node, not the Purkinje fibers, is the origin of electrical impulses. • o Conduction of impulses from the atria to the ventricles The AV node, not the Purkinje fibers, conducts impulses from the atria to the ventricles. • o Transmits electrical impulses from the AV node to the ventricles The Bundle of His, not the Purkinje fibers, transmits electrical impulses from the AV node to the ventricles. • Correct o Conduction of impulses through the ventricles leading to ventricular muscle contraction The Purkinje fibers conduct impulses through the ventricles resulting in ventricular contraction. Question 2 of 14 Which action results in the atria after firing of the sinoatrial (SA) node? • o Repolarization of cardiac muscle A slow movement of ions across the membrane called repolarization, restores the cell to the polarized state. • o Depolarization of cardiac muscle Sodium moves rapidly into the cell making the inside of the cell depolarize. • Correct o Contraction of the atria to move blood to the ventricles The SA node initiates the normal cardiac cycle. The end result is the contraction of the right and left atrium as they push blood into the ventricles. • o Contraction of the ventricle moving blood out to the body Contraction of the ventricles is the result of the impulse reaching the Purkinje fibers that innervates the heart from the base to the apex. Question 3 of 14 Which physiologic process is responsible for repolarization of heart cells? • o Movement of sodium into the cell The rapid movement of sodium into the cell results in the inside of the cell becoming positive compared with the outside of the cell. This is known as depolarization, not repolarization. • Correct o Movement of sodium out of the cell When a cell or groups of cells is stimulated, the cell membrane changes its permeability. This allows sodium to move rapidly into the cell, making the inside of the cell positive compared with the outside (depolarization). A slower movement of sodium ions across the membrane restores the cell to the polarized state, called repolarization. [Show More]

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