265_lab_manual_EKG_F13 - MODULE 3 EKG Pulses and Blood...

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MODULE 3: EKG, Pulses and Blood Pressure An EKG (also called ECG) is a test that checks the electrical activity of your heart. Specifically, it measures the direction and magnitude of action potentials traveling through the conducting system of the heart. A pulse is a pressure wave that can be felt over an artery that lies close enough to the skin. In the figure below you can see that blood pressure changes from a high (of about 120) to a low (of about 80). When the left ventricle contracts and a bolus of blood shoots into the aorta, the high pressure of 120 (systolic pressure) is reached. This pressure wave travels down the arteries and dissipates as arteries branch out into arterioles and capillaries. By the time blood reaches the veins, there is no pulse pressure left, it is just one continuous pressure gradient and it is near 0. There is a very distinct pulse pressure in the aorta, but it is difficult to palpate the aorta because it is so deep in the thoracic and abdominal cavity. However, there are several large arteries that still have a distinct pulse pressure and they are close to the skin and can be palpated.
Blood pressure is taken with an instrument called a sphygmomanometer. This instrument is used to stop blood flow in an artery that has a good pulse pressure and is relatively close to the skin. As pressure is released blood flow will begin to force its way through the artery when the pressure in the cuff is lower than the systolic pressure. This forcing of blood through a narrowed vessel opening creates a sound. A stethoscope is used to assess these sounds and mark the points of systolic and diastolic blood pressure. This lab will include some activities and require some research that will help you understand and appreciate the EKGs, Palpable Pulses and Blood Pressure. There will be an online worksheet that you will enter your answers on. You will be allowed to “Save for Later” and “Submit” the worksheet as many times as you want. However, there are a couple of things to keep in mind. 1. You will not be allowed to Submit your worksheet after the deadline. If you do not submit before the deadline, you may be able to work out a way to submit it as a late assignment but there will be point deductions. 2. If you Submit the lab assignment, and then decide to retake it before the deadline, all of your answers will be gone and you will have to retype all answers before submitting again. The lab worksheet has been reproduced for you on the following pages, so that you can work on things offline. If you have printed the lab manual, you might write notes in the textbox fields, or you might use a .pdf document annotator on your computing device. Whatever you decide to do is fine, but ultimately, only answers entered on the I-learn worksheet can be submitted for grading.
1 Follow the instructions below very carefully. Many of the items in this assignment require reading or videos or something else to do. Be sure to write your answers completely before submitting the assignment. There is

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