Results.pdf - Results Biol 216 Lab 6 Date Time April 9 2020 11:53 am Biol 216 Lab 6 Question Student Answer Question#1 What is the significance of the

Results.pdf - Results Biol 216 Lab 6 Date Time April 9 2020...

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4/9/2020 Results 1/4 Biol 216 Lab 6 Date / Time April 9, 2020 11:53 am Biol 216 Lab 6 # Question Student Answer 1 Question #1: What is the significance of the R-R interval? What is occurring within the heart when the R-wave occurs? The R to R interval is the elapsed time between two R waves which is a function of intrinsic properties of the SA node. R wave is the electrical depolarization when it passes through the main part of the ventricular walls 2 Question #2: What is the significance of the P-R interval? From an electrical activity standpoint, what does this interval represent? What is the position of each of the 4 valves of the heart during this interval? PR interval measures the depolarization of the atria. The P wave is the onset of atrial depolarization which lasts until the the beginining of the QRS complex. The valves are open to allow for filling. 3 Question #3: What is the significance of the R-T interval? Does this represent systole or diastole, and why? Explain, using the position of each of the 4 valves of the heart. The ventricles are in a depolarized state. This represents systole due to ventricular contraction and ejection occuring during this cycle. The blood is being pumped out so the heart is working. The pulmonary and aortic semilunar valves are pushed open due to the increased pressure of the ventricle pushing the blood out. 4 Question #4: What is the significance of the T-R interval? Does this represent systole or diastole, and why? Explain, using the position of each of the 4 valves of the heart. The T-R interval is the duration between the cardiac cycles. This represents how long the ventrilces remain in a polarized state between depolarizations. This represents diastole due to the ventricles being in a relaxed stated and not contracting. The mitral and tricuspid valves are open to allow filling. The aortic and pulmonary are closed. 5 Question #5: What is the name for this pulsatile noise, and what causes it to occur? The noises you hear are Korotkoff sounds and this
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