25
edits
Basics: Difference between revisions
Jump to navigation
Jump to search
→The electric discharge of the heart
| Line 71: | Line 71: | ||
==The electric discharge of the heart== | ==The electric discharge of the heart== | ||
[[Image:conduction_system.svg|thumb| | [[Image:conduction_system.svg|thumb|450px|left|The conduction system of the heart]] | ||
{| class="wikitable" border="1" style="float: right" | |||
|- | |||
| align="center" | <flashow>http://nl.ecgpedia.org/images/b/bc/Normal_SR_vector.swf|height=300px</flashow> | |||
|} | |||
'''The sinoatrial node (SA node) contains the fastest physiological pacemaker cells of the heart; therefore, they determine the [[Rate|heart rate]].''' | '''The sinoatrial node (SA node) contains the fastest physiological pacemaker cells of the heart; therefore, they determine the [[Rate|heart rate]].''' | ||
'''First the [[heart|atria]] depolarize and contract. After that the [[heart|ventricles]]''' depolarize and contract. | '''First the [[heart|atria]] depolarize and contract. After that the [[heart|ventricles]]''' depolarize and contract. | ||
The electrical signal between the atria and the ventricles goes from the sinus node via the atria to the AV-node (atrioventricular transition) to the His bundle and subsequently to the right and left bundle branches, which end in a dense network of Purkinje fibers. | The electrical signal between the atria and the ventricles goes from the sinus node via the atria to the AV-node (atrioventricular transition) to the His bundle and subsequently to the right and left bundle branches, which end in a dense network of Purkinje fibers. | ||
The depolarization of the heart results in an electrical force which has a direction and magnitude; an electrical vector. This vector changes every millisecond of the depolarization. In the animation vectors for atrial depolarization, ventricular depolarization and ventricular repolarization are shown. | The depolarization of the heart results in an electrical force which has a direction and magnitude; an electrical vector. This vector changes every millisecond of the depolarization. In the animation vectors for atrial depolarization, ventricular depolarization and ventricular repolarization are shown. | ||
{{clr}} | {{clr}} | ||