Answered: Elaborate about the AV node why and how…

Phlebotomy Essentials

6th Edition

ISBN:9781451194524

Author:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Publisher:Ruth McCall, Cathee M. Tankersley MT(ASCP)

Chapter1: Phlebotomy: Past And Present And The Healthcare Setting

Section: Chapter Questions

Problem 1SRQ

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Similar questions

Vern, suffering from cardiac arrhythmias, is brought into the emergency room of a hospital. The doctors hook him up to an ECG. He begins to exhibit a decreased R to R interval, and as a result loses consciousness. His anxious partner asks you why he has lost consciousness. a.How would you respond? What is wrong with him, and why did it cause a loss of consciousness. The partner then responds that Vern took nitroglycerine because he was experiencing chest pain known as angina. One of the major side effects of the medication is that the patient will notice a severe headache. b. What does nitroglycerine do? c. How is it administered? d.How does it distribute through the body? e.What is the target cell and mechanism of action on the heart? f. What causes the headache? g.Could the drug have caused the arrhythmia?
A lower mean arterial pressure (MAP) would cause which of the following? Choose all that apply. Activation of the parasympathetic system Activation of the sympathetic system Vasoconstriction of the veins Lower cardiac output Decrease in action potentials from arterial baroreceptors
Describe how the barorecptor reflex explains the higher heart rate during standing. Be sure to describe the barorecptors themselves, the nerves that are involved the brain centers involved and the nerves to the heart that control heart rate.
Which structure is responsible for sending the electrical excitation from the atria towards the ventricles. Left bundle branch Sinoatrial node Right bundle branch Atrioventricular node Purkinje fibers
During which phase of cardiac cycle is pressure in the aorta the highest? a. atrial systoleb. isovolumetric ventricular contractionc. atrial diastoled. ventricular systolee. isovolumetric relaxation
T waves on an ECG representa. depolarization of the ventricles.b. repolarization of the ventricles.c. depolarization of the atria.d. repolarization of the atria.
The standard EKG consists of 10 sensors that record 12 leads of the heart’s electrical activity from different angles, allowing for a thorough three-dimensional interpretation of its activity. This is transmitted by the electrodes to the equipment to be interpreted and is used to diagnose cardiac medical conditions. In case of an abnormal EKG, the second step would be to use a Holter monitor. How would you explain to your classmates how to perform an EKG (steps)? Where will you place the electrodes when performing and EKG? Why? What are the different lead types, connections, and placements? When you conclude an EKG, what are the different components that you need to observe and confirm before you disconnect the patient? Can you explain the difference between normal, abnormal, and artifacts? What is a Holter monitor? Under what circumstances would one be ordered for a patient? How do you use a Holter monitor? Educate a patient: What you will do before, during, and after an…
Which fiber system is the first to depolarize in a cardiac cycle? Group of answer choices AV node AV bundle SA node Purkinje fibers
Explain how sinoatrial node functions in the heartbeat action
Answer quickly Describe the Cardiopulmonary System?
Describe the cardiac effects of the sympathetic nervous system and the parasympathetic nervous system
When the SA node fails, the AV node establishes a new intrinsic heart rate. This will result in Increased parasympathetic output to the SA node Increased blood pressure Increased blood flow through the pulmonary circulation Decreased cardiac output As Decreased sympathetic output to the SA node 20

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Elaborate about the AV node why and how it decreases the action potential