Ecg Exercise Lab 3

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Methods and Materials During this lab I will be connecting patches electrodes to the wrist and left ankle of my little man in this exercise. I will use virtual instruments to display the electrocardiogram (ECG) on the screen. Determine heart rate by measuring the time between adjacent R-Waves. Then I will Measure the time between the P-R, the R-T and the T-P Waves. Finally I will determine which of these three times intervals account for the exercise induced changes in the R-R interval. During the normal cardiac cycle, there is a sequential contraction of the atria and the ventricles, followed by a period of relaxation as the heart fills with blood. Since these sequential contraction are initiated by an action potential, the action potential must first take place in all atria fibers, and then in all ventricular fibers. This synchronous electrical activity in so many cardiac muscle cells produces currents that can be monitored with electrodes placed on the skin; the resulting recording is called electrocardiogram, or ECG. The human ECG consists of five waves, which are expressed as the P-Wave, the QRS complex, and the T-Wave. The following three components of the ECG can be correlated with the action potentials in the atria and ventricles. The P-Wave is produced by atrial depolarization. The QRS wave is created by repolarization of the atria and depolarization of the ventricles. The T-Wave is produced by repolarization of the ventricles. My Materials: My volunteer on CD, Ph.I.L.S. C.D., 3 Electrodes, The Cables, and the ECG machine, and a chair for my volunteer to sit down he exercises. Questions and Answers 1. The electrocardiogram measures? The electrical activity of the heart. B 2. In the atria, the depolarizing phase of the action potential creates? The P-Wave. A 3. In the ventricles, the depolarizing phase of the action potential is

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