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Flashcards in Basic Principles Deck (17):
1

The generation of pacemaking stimuli

Automaticity

2

SA node located

Upper posterior wall of the right atrium

3

Each depolarization wave emitted by the SA node spreads through both atria producing a ...

P wave

4

The simultaneous contraction of the atria forces the blood they contain to pass through the ...

Atria-Ventricular valves between the atria and the ventricles

5

The only conducting path between the atria and the ventricles is the...

AV node

6

Depolarization conducts slowly through the AV node, since it is carried by slow moving ...

Ca ions

7

His Bundle and both bundle branches are bundles of rapidly conducting ...

Purkinje fibers

8

Prukinje fibers use fast moving ions for the conduction. These are?

Na ions

9

Depolarization of the entire ventricular myocardium produces a ...

QRS complex

10

The first downward wave of the QRS complex is the ...

Q wave, is often absent on EKG

11

The downward Q wave is followed by an upward

R wave

12

Any downward wave preceded by an upward wave is an

S wave

13

Rapid phase of ventricular repolarization is represented by the

T wave

14

Begins with the QRS and persists until the end of the T wave

Ventricular systole (contraction)

15

As a simple rule of thumb, the QT interval is considered normal when it is less than of the R to R interval at normal rates.

Half

16

Precise QT interval measurements corrected for rate are called

QTc

17

The movement of three types of ions determines all aspects of the cardiac conduction system

Sodium, calcium, potassium