Electrical Anatomy Flashcards
What is the function of Bachman’s bundle?
Allows rapid depole of the left atrium from the right
What atria fires first?
Right (the AV node sits high in the R atria)
What electrolyte leads to firing of myocardial cells
Calcium influx
What is the polarity of the resting myocardial cell?
Negative, it becomes positive with calcium influx
What state takes energy, depolarization or repolarization of myocardial cells?
Repolarization, there are multiple cellular ATP driven pumps that must restore normal electrolyte concentrations
True or false: pacemaker cells can be seen on an EKG
False, these cells are two small to register on an EKG
What happens when the wave of depolarization from the atria reaches the AV node?
There is a brief pause; this allows the ventricles to finish filling before they start to contract
What part of the AV node leads to a pause when an impulse reaches it?
The mitral and tricuspid valves
When the Bundle of His leaves the AV node what does it immediately branch into?
Right and left bundle branch
What does the left bundle branch divide into?
3 fasicles
- Anterior fasicle
- Posterior fasicle
- Septal fasicle
What direction does the intraventricular septum depolarize?
Left to right (remember this is opposite the direction of depolarization of the atria)
What is the name of the terminating fibers that branch like twigs into the myocardium?
Purkinje fibers
