Review Questions and
Answers 100% Pass Graded A+
David Mungai [Date] [Course title]
, ECG Advanced Skills Exam Review
Questions and Answers 100% Pass
Graded A+
Automaticity - Answer>> Ability to initate impulses at regular
intervals. Pacemaker function. Shift of potassium and sodium out
and into cells. SA node 60-110 bpm.
Excitability - Answer>> Hearts response to stimuli creates an
impulse
Conductivity - Answer>> Ability of the heart to transmit
electrical impulse from cell member to another cell membrane
Contractility - Answer>> Ability of heart to respond by
mechanical shortening fiber (contracts) pumps
Refractoriness - Answer>> Resistant to another stimuli
Absolute refractoriness - Answer>> Cell cannot accept another
stimulus because it is dealing with the last one. Absolutely no
stimulus (NO MATTER HOW STRONG!) can cause
depolarization during this part of the cycle. This period is between
the Q to the beginning portion of T wave.
Relative refractoriness - Answer>> Vulnerable period when a
strong stimulus may result in depolarization. During the T wave.
Polarization - Answer>> Resting stage. Ready for electrical
action. Potassium inside cell and sodium and calcium outside of
cell.
Depolarization - Answer>> Activated stage. Electrical
stimulation then mechanical activity/ contraction. Systolic contract.