TEST BANK For ECGs Made Easy,
7th Edition by Barbara J
Aehlert, All Chapters 1 - 10,
Complete Newest Version
, atrioventricular (AV) node - CORRECT ANSWERS-- a group of cells that conduct an
electrical impulse through the heart.
- located in the floor of the right atrium immediately behind the tricuspid valve and near
the opening of the coronary sinus.
- delays the electrical impulse to allow the atria to contract and complete filling of the
ventricles.
bundle of His - CORRECT ANSWERS-fibers located in the upper portion of the
interventricular septum that receive an electrical impulse from the AV node and conduct
the impulse to the right and left bundle branches.
refractoriness - CORRECT ANSWERS-period of recovery that cells need after being
discharged before they can respond to a stimulus.
myocardial cells - CORRECT ANSWERS-- also known as working cells or mechanical
cells.
- responsible for contraction
- these cells form a thin muscular layer of the atrial walls and the thicker muscular layer
of the ventricular walls.
pacemaker cells - CORRECT ANSWERS-- keeps the heart beating regularly
- they are specialized cells of the electrical conduction system that can form electrical
impulses spontaneously and alter the speed of electrical conduction.
automaticity - CORRECT ANSWERS-ability of pacemaker cells to initiate an electrical
impulse without being stimulated from another source.
is depolarization and contraction the same? - CORRECT ANSWERS-no, depolarization
is electrical and contraction is mechanical.
depolarization - CORRECT ANSWERS-is the movement of ions across a cell
membrane, causing the inside of the cell to become more positive.
7th Edition by Barbara J
Aehlert, All Chapters 1 - 10,
Complete Newest Version
, atrioventricular (AV) node - CORRECT ANSWERS-- a group of cells that conduct an
electrical impulse through the heart.
- located in the floor of the right atrium immediately behind the tricuspid valve and near
the opening of the coronary sinus.
- delays the electrical impulse to allow the atria to contract and complete filling of the
ventricles.
bundle of His - CORRECT ANSWERS-fibers located in the upper portion of the
interventricular septum that receive an electrical impulse from the AV node and conduct
the impulse to the right and left bundle branches.
refractoriness - CORRECT ANSWERS-period of recovery that cells need after being
discharged before they can respond to a stimulus.
myocardial cells - CORRECT ANSWERS-- also known as working cells or mechanical
cells.
- responsible for contraction
- these cells form a thin muscular layer of the atrial walls and the thicker muscular layer
of the ventricular walls.
pacemaker cells - CORRECT ANSWERS-- keeps the heart beating regularly
- they are specialized cells of the electrical conduction system that can form electrical
impulses spontaneously and alter the speed of electrical conduction.
automaticity - CORRECT ANSWERS-ability of pacemaker cells to initiate an electrical
impulse without being stimulated from another source.
is depolarization and contraction the same? - CORRECT ANSWERS-no, depolarization
is electrical and contraction is mechanical.
depolarization - CORRECT ANSWERS-is the movement of ions across a cell
membrane, causing the inside of the cell to become more positive.
