Brief Lab Report 4

Brief Lab Report 4 - Human Cardiovascular System:...

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Human Cardiovascular System: Respiratory effects on human heart rate and vascular flow Name: Steven Pollack TA: Ken Goenner Date: December 6, 2007 Section: 01-R07 Brief Lab Report
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Experiments and Results Before any experiments were conducted the human subject, being a female in our case, was hooked up to a set of measuring instruments. The pneumograph was placed around the stomach of the subject as we visually assessed her to be a “chest breather” and the respective placement maximized movement detection. An ECG was also connected to the subject using lead II, which consists of a negative electrode placed on the right shoulder, a positive one on the left waist, and a ground on the right waist. Heart rate was measured using a fingertip clamp. The photocell and bulb projected peripheral artery expansion and transduced the movement into electrical signals on an oscilloscope using the HumCV program. Systemic arterial pressure was measured using a sphygmomanometer cuff and stethoscope. The measurement began when the cuff pressured exceeded systolic pressure. When turbulent flow was auditorially determined it was measured as systolic pressure, when quiet laminar flow resumed the respective pressure was measured as diastolic pressure. Lastly, systemic venous pressure was measured using a system of precise distance measurements. The subject was instructed to lift her arm slowly from her resting position until the veins in the back of her hand collapsed. The distance between where her arm ended up to where the right atrium lines up at the body, approximately where the third intercostal space adjoins the sternum. Each of these parameters were measured for each exercise, except number 3. (Dilger, pg. 8-4, 8-5) For the first exercise the subject was seated in resting postion while all parameters were determined. This provided the control for the experiment as well as verification of working equipment. Graph 1 shows peripheral pulse, heart rate, ECG, and respiratory
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movements during normal breathing. Arterial blood pressure was determined to be 100/60 mm Hg in the systolic/ diastolic format. Venous pressure was found to be 16.26 mm Hg. The second exercise monitored the parameters under a deep breathing action. This showed changes caused by the thoraco-abdominal pump and pressure variations. Graph 2 contains the same 4 parameters as mentioned in the previous graph. Arterial pressure was measured as 102/60 mm Hg and venous pressure at 14.7 mm Hg. Next, detection of the 2 nd heart beat sound was tracked during inhalation in order to hear an audible split. This sound was due to the closure of the semilunar valves in the heart and the splitting occurred during inhalation. The splitting was heard clearly during each inhalation as the subject was instructed to breathe slowly and deeply to maximize the split. No parameters were recorded for this exercise as auditory verification of splitting was enough. The fourth exercise entailed changing postural positions and recording changes in
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This note was uploaded on 05/18/2008 for the course BIO 335 taught by Professor Cabot during the Fall '08 term at SUNY Stony Brook.

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Brief Lab Report 4 - Human Cardiovascular System:...

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