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68wm6 p2 Car. Dys. Cardiac Dysrhythmias

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68wm6 p2 Car. Dys. Cardiac Dysrhythmias Question Answer How does the sympathetic nervous system affect the heart rate? Speeds it up. How does the parasympathetic nervous system affect the heart rate? Slows it ...

68wm6 p2 Car. Dys. Cardiac Dysrhythmias Question Answer How does the sympathetic nervous system affect the heart rate? Speeds it up. How does the parasympathetic nervous system affect the heart rate? Slows it down. Define cardiac automaticity: inherent (intrinsic) ability to contract in a rhythmic pattern. Abiity of the heart to sustain its own impulses. Define cardiac irritability: ability to respond to a stimulus. At what rate does the SA node generate impulses? 60-100 a minute When the impulse leaves the SA node, how does it travel through the atria? Through the bachmans bundle and internodal pathways. At what rate can the AV node generate impulses if not recieved from the SA node? 40-60 per minute (the back-up pacemaker of the heart) Define purkenje fibers A diffuse network of muscle fibers located just beneath the endocardium, resulting in contraction and emptying of the ventricles. At what rate can the purkenje fibers generate impulses if not recieved from the SA and AV nodes? 20-40 per minute The electrocardiogram gives how many views of the hearts electrical activity with how many electrodes? 12 leads(views) from 10 electrodes What is the cardiac cycle composed of? Electrical activity caused by automaticity and the mechanical response of contraction. What are the two phases of the ELECTRICAL activity of the heart? Depolorization and Repolarization. What are the two phases of the MECHANICAL activity of the heart? Systole and Diastole a 1mm square (small box) on an EKJ sheet represents how many seconds? 0.04 seconds a 5mm section (large box) of and EKG sheet represents how many seconds? 0.20 seconds What does the vertical axis of the EKG represent? Voltage A 1 mm grid interval on the verticle axis represents what? 0.1 mV (one millivolt) What is the most exact method to determin a regular rhythm using an EKG? 1500 method What is the Positive (upward) Complex? Heart’s current flows towards the positive electrode What is the Biphasic Complex? Heart’s current flows perpendicular to the positive electrode

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