Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
15 Cards in this Set
- Front
- Back
The intrinsic firing rate of the AV node is ___ to ___ times per minute.
|
40, 60
|
|
The thick middle tissue layer of the heart is the
|
myocardium
|
|
Slowing of the electrical impulse at the AV node is necessary to allow time for the _______ to fill with blood
|
ventricles
|
|
The mitral valve is also known as the _______ valve
|
L atrioventricular
|
|
Which of the following describes the ability of a cardiac cell to propagate the electrical impulse to another cell
|
Conductivity
|
|
The pressure in the left ventricle at the end of diastole is called
|
preload
|
|
An action potential begins in a myocardial cell when
|
sodium enters the cell, giving it a positive charge
|
|
the total duration of ventricular depolarization is represented by the ___ interval.
|
QT
|
|
The SA and AV nodes are often supplied by both the _____ and ______ arteries
|
R coronary, circumflex coronary
|
|
Which of the following is the correct sequence of cardiac electrical activity
|
4,2,1,3,6,5
|
|
The amount of resistance that must be overcome by the left ventricle during systole is called
|
afterload
|
|
Approx ______ Americans die each year of CHD
|
466,000
|
|
At standard speed, a 1mm box on ECG paper represents _____ seconds
|
.04
|
|
The relative refractory period of the myocardium is represented by the
|
down slope of the T wave
|
|
Which of the following arteries supplies blood to the left ventricle, interventricular septum, and portions of the cardiac conduction system
|
left coronary
|