EKG 4

What structures maintain control of the blood flowing through the heart?

• atria

• ventricles

• septum

• valves

Impulses from the AV node go through the ___________ to the right and left bundle branches.

• Bundle of HIS

• Intra atrial pathways

• Purkinje fibers

• none of the above

When a site speeds up and takes over as the pacemaker, it is referred to as:

• Irregularity

• Bradycardia

• Ectopic pacemaker

• none of the above

The inherent rate of the SA node is:

• 100-150 bpm

• 40-60 bpm

• 60-100 bpm

• none of the above

Which interval is used to determine if the atrial rhythm on an EKG tracing is regular or irregular?

• QT interval

• R to R interval

• P to P interval

• PR interval

The inherent rate of the AV junction is:

• 40-60 bpm

• 60-100 bpm

• 20-40 bpm

• none of the above

Tall, peaked T-waves observed on an EKG are most commonly seen in patients with:

• Hypokalemina

• Hyperkalemia

• Hyponatremia

• Hypernatremia

_______________ cells are specialized cells responsible for the spontaneous generation of electrical impulses.

• contractile

• pacemaker

• purkinje

• none of the above

The U waves are thought to represent:

• ventricular depolarization

• atrial depolarization

• asystole

• repolarization of the purkinje fibers

The anterior surface of the heart consists mostly of:

• left atrium

• right atrium

• right ventricle

• left ventricle