Chapter 1: The Cardiac Cycle Flashcards
The electrical conduction system completes the normal circuit to?
Elicit a heartbeat.
The heart then recovers electrically and briefly relaxes before a new impulse is?
Begun by the SA node and the cycle begins again.
The cycle of one heartbeat is known as?
Cardiac Cycle.
An electrocardiogram is a graphic representation of?
The cardiac cycle.
What is a P wave (1)?
An electrical impulse arises from the SA node, the impulse travels through the atria making an atrial contraction.
What is a QRS complex (2)?
The impulse passes through the AV node from the atria to ventricles, triggering ventricular contraction.
What is the third step (3)?
Impulse travels through the bundle of His and the Purkinje fibers.
What is a T wave (4)?
Muscles of the atria and ventricles return to resting state and prepare for another set of contractions.
What is the U wave (5)?
A small, upright and rounded bump.
When does U wave occurs?
When the ECG machine picks up depolarization of the Purkinje fibers.
When observed, the U wave follows which wave?
T wave.
