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NPBlec27 - Flashcards

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Class:NPB 101 - Systemic Physiology
Subject:Neurobiology,Physio & Behavior
University:University of California - Davis
Term:Fall 2010
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inotropism an increase in force of contraction caused by increase in the concentration of calcium in cardiac cells
positive inotropism SNS increases total amount of calcium, to increase excitation/contraction coupling
negative inotropism PNS decreases amount of calcium available in atria
bradycardia decrease in heart rate
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tachycardia increase in heart rate
What is an EKG? an electrocardiogram: it measures the net vector of cardiac activity at surface of the body (skin), records potential leads but is not a membrane potential. a normal one will record 70 waves/minute
P wave electrical activity produced during ATRIAL depolarization (associated with atrial contraction). first little hump on wave.
Q,R,S complex electrical activity produced during VENTRICULAR depolarization, associated with ventricular contraction. follows p wave, spikes up and down
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T wave electrical activity associate with ventricular repolarization (ventricular relaxation) (atrial relaxes / repolarizes during QRS, just can't see electrical activity)
Fibrillation type of arrhythmia; the whole myocardium will experience desynchronization- loss of coordinated contraction so heart can't pump blood. (defibrillator used to try and synchronize)
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 inotropisman increase in force of contraction caused by increase in the concentration of calcium in cardiac cells
 positive inotropismSNS increases total amount of calcium, to increase excitation/contraction coupling
 negative inotropismPNS decreases amount of calcium available in atria
 bradycardiadecrease in heart rate
 tachycardiaincrease in heart rate
 What is an EKG?an electrocardiogram: it measures the net vector of cardiac activity at surface of the body (skin), records potential leads but is not a membrane potential. a normal one will record 70 waves/minute
 P waveelectrical activity produced during ATRIAL depolarization (associated with atrial contraction). first little hump on wave.
 Q,R,S complexelectrical activity produced during VENTRICULAR depolarization, associated with ventricular contraction. follows p wave, spikes up and down
 T waveelectrical activity associate with ventricular repolarization (ventricular relaxation) (atrial relaxes / repolarizes during QRS, just can't see electrical activity)
 Fibrillationtype of arrhythmia; the whole myocardium will experience desynchronization- loss of coordinated contraction so heart can't pump blood. (defibrillator used to try and synchronize)
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