ECG ORIENTATION KAISER
DEPOLARIZATION - Answers -Movement of ions (Na+, Ca+, K+) across cell
membrane causing inside of cell to become more positive, electrical conduction results
in contraction. Na+ channels open. Positive inside, negative outside.
REPOLARIZATION - Answers -movement of ions across cell membrane where inside
of cell is restored to its negative charge. Sodium channels close. Potassium channels
open. Active transport by sodium-potassium pump
DEPORIZATION - Answers -ELECTRICAL
CONTRACTION - Answers -IS MECHANICAL. CONTRACTION FOLLOWS
DEPOLARIZATION.
WHAT OCCUR FIRST? ELECTRICAL CONDUCTION, OR MECHANICAL
CONTRACTION? - Answers -ELECTRICAL CONDUCTION
P WAVE - Answers -ATRIAL DEPOLARIZATION
QRS - Answers -VENTRICAL DEPOLARIZATION
T WAVE - Answers -ventricular repolarization
REFRACTORY PERIOD - Answers -the period of resistance to stimulation, cardiac cells
unable to respond to stimulus
relative refractory period - Answers -cardiac cells have repolarized enough to respond
to strong stimulus
automaticity - Answers -Ability of pacemaker cells to spontaneously initiate an electrical
impulse, SA node, AV junction, and Purkinje fibers
excitability - Answers -ability to respond to stimuli
conductivity - Answers -Ability to receive an electrical stimulus and conduct that impulse
to adjacent cells - all cardiac cells possess this.
contraction - Answers -Cardiac cells shorten, causing muscular contraction in response
to an electrical stimulus
SA node - Answers -Sino-atrial node; the pace-maker of the heart; where the impulse
conduction of the heart usually starts; located in the top of the right atrium. 60-100 bpm
DEPOLARIZATION - Answers -Movement of ions (Na+, Ca+, K+) across cell
membrane causing inside of cell to become more positive, electrical conduction results
in contraction. Na+ channels open. Positive inside, negative outside.
REPOLARIZATION - Answers -movement of ions across cell membrane where inside
of cell is restored to its negative charge. Sodium channels close. Potassium channels
open. Active transport by sodium-potassium pump
DEPORIZATION - Answers -ELECTRICAL
CONTRACTION - Answers -IS MECHANICAL. CONTRACTION FOLLOWS
DEPOLARIZATION.
WHAT OCCUR FIRST? ELECTRICAL CONDUCTION, OR MECHANICAL
CONTRACTION? - Answers -ELECTRICAL CONDUCTION
P WAVE - Answers -ATRIAL DEPOLARIZATION
QRS - Answers -VENTRICAL DEPOLARIZATION
T WAVE - Answers -ventricular repolarization
REFRACTORY PERIOD - Answers -the period of resistance to stimulation, cardiac cells
unable to respond to stimulus
relative refractory period - Answers -cardiac cells have repolarized enough to respond
to strong stimulus
automaticity - Answers -Ability of pacemaker cells to spontaneously initiate an electrical
impulse, SA node, AV junction, and Purkinje fibers
excitability - Answers -ability to respond to stimuli
conductivity - Answers -Ability to receive an electrical stimulus and conduct that impulse
to adjacent cells - all cardiac cells possess this.
contraction - Answers -Cardiac cells shorten, causing muscular contraction in response
to an electrical stimulus
SA node - Answers -Sino-atrial node; the pace-maker of the heart; where the impulse
conduction of the heart usually starts; located in the top of the right atrium. 60-100 bpm
