EKG Prelecture

Cells that can generate regular action potentials without a nerve stimulus are

• excitable cells

• nueropathic cells

• myogentic cells

• desmoticity cells

When the net electrical charge inside the cell changes

• depolarization

• repolarization

• defibrillation

• refibrillation

Causes contraction of the atria

• SA node

• AV node

• Bundle Branches

• Purkinje Fibers

The ventricular walls contract as a result of depolarization of the

• SA node

• AV node

• Purkinje fibers

• Bundle Branches

Heart muscles cells can communicate actions potentials from one to another through

• gap junctions

• neuromuscular junctions

• acetylcholine

• myosin fibers

Select the ion that is NOT involved in contraction of cardiac muscle cells

• Potassium

• Calcium

• Sodium

• Chloride

The primary pacemaker of the heart is the

• SA node

• AV node

• Apex

• Purkinje fibers

A lack of oxygen available to cells that may cause death

• Ischemia

• Hypoxia

• Anoxia

• Alkaline

The calculated maximum heart heart for a human is

• 200 bpm

• 300 bpm

• 180 bpm

• 100 bpm

The SA node is located in the

• right atrium

• left atrium

• aorta

• ventricles