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Systolic Pressure Lab Report

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Systolic pressure(SP) is the highest pressure reached in artery after ventricular systole; Diastolic pressure(DP) occurs during ventricular diastole and Pulse pressure(PP) is the difference between these two. Their physiological determinants are the ability of the ventricles to pump a large amount of the blood. So the greater the amount of blood pumped by the ventricles, i.e the greater the stroke volume, the higher the value of systolic pressure, hence pulse pressure increases. They will be determined by the capacity of the aorta to expand and hold the volume of blood from the ventricles, so its compliance. As the aorta expands to hold the blood from the ventricles, the pressure inside it will drop, hence the systolic pressure drops. So a fairly strong aorta that does not expand easily will increase systolic …show more content…

This is because of gravity that forces blood towards the the lower limbs and hence less blood is going towards the heart; venous return decreases. Hence cardiac output decreases, which in turn decreases MAP. This is clearly seen through the results from the experiment: where MAP dropped from 105 to 82 mmHg soon immediately after standing. (CO dropped from 7.4 to 5.6 L/min). So we can say that immediately after standing the upper part of the body have poor perfusion. But the body will compensate for this change to protect sensitive organ in the upper part of the body, particular the brain. The baroreceptor of the body detect this, and cause several changes. It cause an increase in heart rate (in our exit from 81 to 104 bpm) and and cause the arterioles in the lower extremities to contract. This will cause an increase in MAP to normal as we noticed in our experiment where the MAP rose to 98 mmHg again. Because of the vasoconstriction, we would have expected an increase in TPR but this was not the case of our

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