MEAS 238/239 - CHAPTER 49
QUESTIONS WITH CORRECT
ANSWERS!!
Depolarization - ANSWERThe electrical impulse that initiates a chain reaction
resulting in contraction.
Sinoatrial (SA) node (pacemaker) - ANSWERElectrical impulses occur at a rate of 60
to 100 beats per minute, initiating the heartbeat with an electrical impulse that
causes depolarization.
Atrioventricular (AV) node - ANSWERDelays the electrical impulse to allow for the
atria to complete their contraction and ventricles to fill before the next contraction;
also serves as a secondary pacemaker if the SA node fails.
Bundle of His (AV bundle) - ANSWERConducts electrical impulses from the atria to
the ventricles.
Bundle branches - ANSWERConduct impulses down both sides of the
interventricular septum.
Purkinje fibers (network) - ANSWERDistribute the electrical impulses throughout the
right and left ventricles.
P wave - ANSWERAtrial depolarization with resulting atrial contraction.
QRS complex - ANSWERVentricular depolarization and resulting ventricular
contraction (larger than the P wave); atrial repolarization occurs (not seen).
T wave - ANSWERVentricular repolarization.
U wave - ANSWERRepolarization of the bundle of His and Purkinje fibers (not
always seen); may be seen in instances of electrolyte imbalance.
PR interval - ANSWERBeginning of atrial depolarization to the beginning of
ventricular depolarization.
QT interval - ANSWERPeriod of time from the start of ventricular depolarization to
the end of ventricular repolarization.
ST segment - ANSWERTime between ventricular depolarization and the beginning
of ventricular repolarization.
The most common electrocardiograph is? - ANSWER12-lead
QUESTIONS WITH CORRECT
ANSWERS!!
Depolarization - ANSWERThe electrical impulse that initiates a chain reaction
resulting in contraction.
Sinoatrial (SA) node (pacemaker) - ANSWERElectrical impulses occur at a rate of 60
to 100 beats per minute, initiating the heartbeat with an electrical impulse that
causes depolarization.
Atrioventricular (AV) node - ANSWERDelays the electrical impulse to allow for the
atria to complete their contraction and ventricles to fill before the next contraction;
also serves as a secondary pacemaker if the SA node fails.
Bundle of His (AV bundle) - ANSWERConducts electrical impulses from the atria to
the ventricles.
Bundle branches - ANSWERConduct impulses down both sides of the
interventricular septum.
Purkinje fibers (network) - ANSWERDistribute the electrical impulses throughout the
right and left ventricles.
P wave - ANSWERAtrial depolarization with resulting atrial contraction.
QRS complex - ANSWERVentricular depolarization and resulting ventricular
contraction (larger than the P wave); atrial repolarization occurs (not seen).
T wave - ANSWERVentricular repolarization.
U wave - ANSWERRepolarization of the bundle of His and Purkinje fibers (not
always seen); may be seen in instances of electrolyte imbalance.
PR interval - ANSWERBeginning of atrial depolarization to the beginning of
ventricular depolarization.
QT interval - ANSWERPeriod of time from the start of ventricular depolarization to
the end of ventricular repolarization.
ST segment - ANSWERTime between ventricular depolarization and the beginning
of ventricular repolarization.
The most common electrocardiograph is? - ANSWER12-lead
