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WorksheetsStudy Guide
Total questions: 20
Worksheet time: 15mins
Myocardial contraction is caused by (a) of the mytocytes.
The recovery phase that follows depolarization is known as…
Both depolarization and repolarization of the myocardium are _____ phenomena caused by the movement of ____.
(a)
The heart’s electrical activity may be detected and recorded from the ____ surface by sensitive monitoring equipment.
blood
Name TWO types of equipment the heart’s electrical activity may be detected by:
MRI machine
Defibrillator
EKG machine
Telemetry devices
Pulse oximeter
When you see an upward wave on EKG, it represents a depolarization wave moving moving toward a (a) electrode.
A wave of depolarization advancing through the myocardium is a moving wave of ______ charges.
electrical
These sensors are put on the skin to detect the heart’s electric activity:
Electrodes
The SA Node is located in the upper-posterior wall of the right (a) .
What does the SA Node do?
Protects your entire body from high and low interval depolarization waves.
Stops high interval depolarization waves from entering your heart
Initiates a depolarization wave at regular intervals to accomplish its pacemaking responsibility
Creates many high interval depolarization waves to enter the heart
The ability of the SA Node to generate to generate pace-making stimuli is known as (a) .
Each depolarization wave of + charges proceeds outward from the SA Node and stimulates both atria to…
slowly die
produce stronger cells
When you see a P wave on an electrocardiogram, electrically speaking, it represents atrial (a) .
Atrial depolarization is recorded as a _ wave on EKG
P
X
B
E
As the wave of depolarization moves through both atria, there is a simultaneous wave of atrial (a) .
The P wave represents the depolarization and contraction of both (a) .
The left atrium contracts, forcing oxygenated blood through the ____ valve into the left ventricle.
Both atria contract simultaneously, then both (a) contract simultaneously.
The muscular left ventricle contracts, forcing oxygenated blood through the aortic valve into the ____.
When the ventricles contract, the blood they contain cannot flow back into the atria due to the very efficient ____ valves.
AV valves
