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lab 8 quiz
| Question | Answer |
|---|---|
| the pacemaker region of the heart is the: | SA node (sinoatrial) |
| the conducting tissue of the heart located in the interventricular septum is the: | AV bundle (bundle of His) |
| indicate the electrical events that produce each of these waves: P wave: QRS wave: T wave: | P wave: depolarization of atria - leads to contraction of atria QRS wave: depolarization of ventricles (repolarization of atria) - lead to contraction of ventricles T wave: repolarization of ventricles - leads to relaxation of ventricles |
| the electrical synapses between adjacent myocardial cells are called: | gap junctions |
| an abnormally fast rate of beat is called _____; and abnormally slow rate is called _____ | tachycardia(>100bpm); bradycardia(<60bpm) |
| an abnormally long PR interval indicates a condition called: | AV/heart block |
| leads 1, 2, & 3 are collectively called the: | standard limb leads |
| which ECG wave must occur before the ventricles can contract? | QRS wave |
| Which ECG wave must occur before the ventricles can relax? | T wave |
| Which property makes the normal pacemaker region of the heart function as a pacemaker? | SA nodes fire more rapidly |
| The ECG wave that occurs at the beginning of ventricular systole is the: | QRS wave |
| The ECG wave that occurs at the end of systole and the beginning of diastole is the: | T wave |
| The ECG wave completed just before the end of ventricular diastole is the: | P wave |
| The nerve that increases the rate of discharge of the SA node is a: | sympathetic nerve |
| The specific nerve that, when stimulated, causes a decrease in the cardiac rate is the: | parasympathetic |
| The scientific term for insufficient blood flow to the heart muscle is: | myocardial ischemia |
| label P wave, QRS complex, T wave, P-R interval, Q-T interval, & T-Q interval, & sketch typical ECG pattern (label axes, waves, intervals) | yup |
| what events are happening: R wave: P-R interval: Q-T interval: T-Q interval: | R wave:ventricular depolarization P-R interval:P-QRS atria depolarization-leads to contraction & signal to cross AV node Q-T interval:ventricle depolarization-leads to ventricular systole & contraction T-Q interval:ventricular repolarization & diastle |
| what happened to the T-Q measurement as the subject went from rest to exercise? what is this interval measuring? why did it change? | decreased; diastole; faster heart rate |
| ECG: | electrocardiogram: electrical activity of heart |
| conduction system of heart | SA node->atria depolarization->AV node->AV bundle->R&L bundle branches depolarization->apex of heart purkinje fibers -non-contractile cardiac cells (not nerve cells) |
| what is the unit measured in ECGs? | mV |
Created by:
alaynak