Electrifying
heart's ability to initiate an impulse w/o stimulation
What is automaticity
secondary back up to the SA Node
What is the ventricle
The electrical impulse initiates here
What is the SA Node
One small box measures how much time
What is 0.04
beginning of the P wave and the begiinning of the QRS
What is PR inteval
Heart cells ability to recive and transmit an electrical impulse
What is conductivity
Primary back up to the SA Node
What is AV Junction
The 2nd stop in the path of the electrical impulse
What is AV Node
One box measures how much time
What is 0.20
beginning and the end QRS.
What is QRS interval
Heart muscle's ability to shorten in response to an electrical stimuli
what is contractibility
Pacemaker of the heart
SA Node
What comes after the AV node in the path
What is bundle of His
What is a normal time for the QRS complex
What is 0.06-0.10 seconds
beginning of the QRS and the end of the T Wave.
What is QT interval
Ability of heart muscle cells to respond to an impulse or stimuli
What is excitibility / irritability
When the SA Node fails or slows and a backup takes over
What is escape
The electrical current goes here after the bundle of His
What are purkinje fibers
What is the normal PR inteval time
What is 0.12-0.20
A change here indicates damage to the heart muscle
What is the ST segment
What initiates the heart electrical impulse
What is pacemaker cells
When a backup speeds up and overtakes the SA node
What is usurpation
The last stop in the electrical current
What is the Ventricles
5 boxes measures how much time
What is 1 second
Perfect P-QRS-T intervals is called this
What is normal sinus rhythm