Conduction System & Innervation
About this set
Created by:
TheTristan Plus on April 24, 2012
Subjects:
Log in to favorite or report as inappropriate.
Order by
8 terms
Terms | Definitions |
|---|---|
 Myogenic | Able to create its own AP (NV isn't required but can change rhythm) |
| Sinoatrial Node | Creates its own AP (travels .8-1 m/sec) to initiate muscle contraction, a muscle that lies in the wall of the right atrium. Sets the basic heart rate at 70-80 impulses per minute. Heart pacemaker. Spreads through myocardium, signaling atria to contract. |
| Atrioventricular Node | AP comes from internodal pathway. Located in the inferior part of the interatrial septum where AP is slowed to .03-.05 m/sec. Insures the two atria contract before two ventricles. |
| Atrioventricular Bundle | Bundle of His (modified bundle of myocytes). AP quickly come here, entering the interventricular septum. |
| Bundle Branches | While in the interventricular septum it divides into the right and left. |
| Purkinje Fibers | The impulse then becomes Purkinje Fibers which approach the apex and turn superiorly into the ventricular walls. |
| Parasymphathetic Fibers | Slow heart rate and arise as branches of the vagus nerve in the neck and thorax. Innervates at the SA & AV nodes and coronary arteries. |
| Sympathetic Fibershttp://quizlet.com/11614339/edit/#add-row | Increase rate and force of heart contractions. Travel to heart from cervical and upper thoracic chain ganglia. Innervates at the SA & AV nodes, coronary arteries and cardiac musculature throughout the heart. |
First Time Here?
Welcome to Quizlet, a fun, free place to study. Try these flashcards, find others to study, or make your own.