Biology 124L Cardio Lab

Biology 124L Cardio Lab - Yu Huang Biology Lab 124...

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Yu Huang Biology Lab 124 CardioLab March 25, 2008 Assignment 1: 1. Effect of Blood Viscosity on Mean Arterial Blood Pressure a. The higher the blood viscosity, the higher the blood pressure should be. b. When the viscosity was increased, the MAP also increased. This does make sense because the thicker a fluid is, the more pressure is needed to push the liquid. This confirms the hypothesis that a higher blood viscosity will lead to a higher MAP. c. When the viscosity was decreased, the MAP also decreased. This also makes sense because the thinner a liquid is, the more easily it’s pushed. This relates to the inverse of the hypothesis; if the blood viscosity is decreased then MAP will also decrease. 2. Effect of Blood Vessel Radius on Mean Arterial Blood Pressure a. If the blood vessel diameter is increased, then the blood pressure will decrease. If the blood vessel diameter is decreased, then the blood pressure will increase. b. The hypothesis was confirmed, because the narrower a blood vessel the less blood can be pumped through it and on a closed system with a fixed volume this means that the pressure will increase. Similarly if the diameter is increased on a fixed system then the pressure within it will decrease. This does make sense. c. When simulated, higher blood pressure was the result. 3. Effect of Heart Rate on Cardiac Output and Mean Arterial Pressure a. If the heart rate increases, then the blood pressure will also increase. If the heart rate decreases, then the blood pressure will also decrease. b. The simulations confirmed the hypotheses. After an increase in heart rate, the MAP increased. Then, when the heart rate was decreased, MAP similarly decreased. This makes sense because when the heart beats faster, it pumps blood faster, which will increase pressure. 4. Effect of Stroke Volume on Cardiac Output and Mean Arterial Pressure a. When stroke volumes are increased, the blood pressure increases. When diastolic ventricular volume is increased, the amount of blood pulled into the heart during the diastole period increases which means that more blood is pumped out during systole. b.
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Biology 124L Cardio Lab - Yu Huang Biology Lab 124...

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