HTHSCI 1H06 Lecture Notes - Lecture 5: Perfusion, Adrenal Gland, Medulla Oblongata
8 Feb 2016
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Document Summary
It is the volume of blood that flows through any tissue in a given period of time (ml/min) Pressure difference: increased pressure at arterioles, decreased pressure at venous end. Resistance to blood flow: when vessel is small or narrowed due to the lumen opening being smaller, there will be an increase in resistance. It is the pressure (force) exerted by the blood on the walls of the vessel (hydrostatic pressure) The pressure is mostly generated by ventricular contraction; ventricles push blood out, will than create pressure on the arteries (will occur on both the left and right side) Pressure will be highest around the aorta: 35 mm hg entering the capillaries, 0 mm hg entering the right atrium. Bp will fall steadily in systemic contraction with distance from left ventricle. If there is a decrease in blood volume over 10%, than there will be a decrease in bp, and cell tissue will then begin to die.
