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BLOCK 6 Physiology > Electrical activity of heart > Flashcards

Flashcards in Electrical activity of heart Deck (13)
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1

Period of contraction, force generation and blood expulsion

Systole

2

Period of relaxation, filling with blood, readying for next systole

Diastole

3

Left atrial fibrillation would most greatly affect filling of which other heart chamber?

Left ventricle

4

This is the first to depolarize, and is located in right atrium. What does it do?

SA node, pacemaker which causes atrial contraction

5

True/False: there are gap junctions between an atrial muscle to a ventricle muscle.

False, there are NONE, no comunication

6

A lot of arrhythmia are due to a problem in the________.

AV node

7

AV node ____ conduction.

Slows

8

_______ has large diameter cells and speeds up ventricular myocytes.

Perkinje system

9

With ventricular myocytes ________ occurs.

contraction

10

What is the flow of depolarization?

SA node fires
Atria depolarize
Septum and inner layer of ventricular muscle depolarizes
Ventricles depolarize
Coordination of depolarization allows for maximal blood ejection.

11

How does depolarization start in heart?

Starts at apex in Inter-ventricular septum depolarizes first and then depolarization wave heads up towards atrium

12

SA node is the pacemaker of the heart because why?

it depolarizes the fastest

13

When something has a firing rate faster than the SA node what is this called? and why can this happen?

Ectopic pacemaker
SA node slows
Ectopic is faster
(can live off of AV node)