The intent of this experiment was familiarize the student with using transducer to measure pressure and displacement. In this experiment the human cardiac functions of blood pressure and heart rate were measured using a sphygmomanometer. These measurements were then used to calculate the cardiac output, mean arterial pressure, and total peripheral resistance.
Students also gained experience using linear variable resistance sensors, to measure displacement in real time, as well as implementing voltage dividers. For this experiment, two different circuits were created and measured for their change in output voltage. It was concluded that the voltage across the circuit decreased when a resistor was place in series with a voltage divider.
INTRODUCTION
Pressure and displacement measurements are fundamental tools when dealing with the human body, specifically the
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The pressure reading of the ejection of blood into the arteries is known as the arterial systolic pressure. It is also the highest blood pressure observed during the systolic period of the heart contraction. Diastolic pressure is the decrease in pressure after the systolic, as the heart prepares for another beat. It is also the lowest blood pressure observed during the diastolic period during heart contraction. The average systolic pressure of a healthy adult is 120 millimeters of Mercury (mmHg) and average diastolic pressure is 80 millimeters of Mercury (mmHg). Mean arterial pressure (MAP) is the time averaged value of the pressure waveform over a single cardiac cycle. This calculation can be done in two different ways, represented by Equation 01, which calculates the MAP using the time when systole begins and the time when diastle ends, and Equation 02, which gives an approximate value for the MAP if the entire trace of the waveform is not readily available. Both these equations can be found in the equations section of this