Anatomy & Physiology
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each of the black spaces below before clicking
on it to display the answer.
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| Automaticity | Ability of pacemaker cells to INITIATE an electric stimulus spontaneously WITHOUT external stimulus
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| Excitability is the ability of cardiac muscle cells to ___ to an ___ electric stimulus | Respond; outside
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| Conductivity is the ability of cardiac cells to ___ an electric impulse and propagate the impulse to __ | Receive; next cell
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| Contractility is the ability of cardiac cells to shorten ___ | In respond to electric stimulus
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| In diastole the __ of the cell is electrically more ___ than __ of the cell | Inside; negative; outside
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| In resting state, there are more __ ions than __ inside the cell | K+, Na+
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| Depolarization is the ___ of the cell membrane | Electrical excitation
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| Repolarization is the ___ of cell membrane to its ___ ___ | Return; resting states
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| In repolarization, the channels for __ open and it flows out, taking the __ charge with it | K+, positive
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| At end of ___, the Na-K pumps in cell membrane move potassium in and sodium out of cells | Repolarization
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| ___ is the primary pacemaker of the heart | SA node
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| SA Node cells depolarize automatically at rate of ___ | 60-100
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| AV Node can function as the ___ of the heart | Backup pacemaker
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| AV Node automatically depolarize at rate of ___ | 40-60
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| AV Node ___ the conduction of the impulse from atria to ventricles from dangerously fast rate | Slows
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| Bundle of HIS is | Short bundle of fibers at bottom of AV node leading to BBs
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| Bundle Branches | Carry impulse into R and L ventricles.
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| Purkinje fibers act as the ___ pacemaker, automatically depolarizing at rate of | Final backup; 20-40
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| P wave represnts | Atrial depolarization as impulse travels through atria
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| PR interval represents | Atrial depolarization + AV conduction time
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| Normal PR interval is | 0.12-0.20
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| QRS represents | Ventricular depolarization and intraventricular conduction time
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| Q wave represents | 1st negative deflection from baseline
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| R wave represents | 1st POSITIVE deflection from baseline (ALWAYS upright)
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| S wave represents | Negative deflection following R
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| Normal width of QRS | 0.06-0.10
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| T wave repesents | Ventricular repolarization
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Created by:
choel
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