KINESIOL 1YY3 Lecture Notes - Lecture 9: Mean Arterial Pressure, Brachial Artery, Blood Vessel
2 Feb 2016
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Pressure throughout the whole system is called the driving pressure or the mean arterial pressure - not the average! Flow aka cardiac output - l/min of blood out of the heart. Resistance - anything that can slow down the flow of the blood. If we increase viscosity (thickness) = increase in resistance. Viscosity is determined by the rbc count compared to the plasma in our blood. Vasculature doesn"t really change the length of the tube. This only happens if we"re growing in size. We can slightly alter the length by opening and closing capillary beds. Any small changes of the size of the lumen (hole where the blood flows) will have a dramatic change because it"s to the power of 4. Main way of changing the resistance is due to changing the diameter/radius of the vessel. Laminar flow - straight blood vessel and the blood moves very easily through the vessel.
