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Carnegie ECG

Test One

QuestionAnswer
What describes the ability of the heart to initiate its own impulse? Automaticity
What describes the ability of the heart to respond to an impulse? Excitability
What is the rate of automaticity of the AV node? 40-60
What is the rate of automaticity of the His-Purkinje fibers? 20-40
Which phase is depolarization? Phase 0
Which ion causes depolarization in the muscle cell? Na+
What ion causes depolarization in the pacemaker cell? Ca2+
Each heartbeat is initiated by a current originated where? SA node
The Mechanical contraction of the ventricles is a direct effect of ventricular _______ depolarization
The neurotransmitter for the sympathetic nervous system is ________ epinephrine
The neurotransmitter for the parasympathetic nervous is ________ Acetylcholine
The rate of automaticity for the sinus node is ____ 60-100
T or F; Mechanical events are caused by electrical events True
T or F; Potassium is the repolarizing ion True
T or F; Potassium is the depolarizing ion False
T or F; The sinus node is the dominate pacemaker because it is the fastest True
Tor F Acetylchoine increases heart rate, conduction and contractility False
What electrical activity happens during the P-wave Atrial depolarization
What electrical activity happens during the P-R segment Delay through the AV node, bundle of His, bundle branches and Purkinjie fibers
What electrical activity happens during the P-R interval Atrial depolarization and delay through the AV node, bundle of His, bundle branches and Purkinjie fibers
What electrical activity happens during the QRS complex Ventricular depolarization
What electrical activity happens during the ST segment Ventricular reploarization
What electrical activity happens during the T wave Ventricular repolarization
Define Contractility The ability of the heart muscle cells to shorten in response to an electrical stimulus
Define Depolarization An electrical current that initiates the contraction of the heart muscle
Define Repolarization The heart muscle cells return to their resting electrical state the heart muscles relax
Define Conductivity/Propogate the ability of the heart cells to receive and transmit an electrical impulse
Define Excitability The ability of the heart muscle cells to respond to an impulse or stimulus
What is cardiac output? How much blood the heart pumps/min HR x SV= CO
What is the blood flow? VC-RA-TV-RV-PV-PA-Lungs-PV-LA-MV-LV-AV-Aorta-Body
What is systole? The contraction of the ventricles (top of fraction 140/90)
What is diastole? The relaxation of the ventricles (bottom of fraction 140/90)
What is Phase 0? Depolarization, Threshold Membrane Potential (TMP) -60/-70mV
What is Action Membrane Potential Stimulus to open other channels, +30/+40 mV
What is Resting Membrane Potential -80/-90 mV (no movement)
What happens in phases 1,2,3 Repolarization, Potassium goes out of the cell
What happens during the end of Phase 3 beginning of phase 4 Sodium/Potassium Pump
What is the "All or None" principle? Anything less than +30mV will not be enough electrical stimulus to make the muscle contact
What is pulseless electrical activity? No pulse, but electrical current
What is the normal rate for the AV node? 60-100x/min
What is the normal rate for the SA node? 40-60x/min
What is the normal rate for the HIS/BB/PF? 20-40x/min
Created by: ICVT55