PHGY 210 Lecture Notes - Lecture 3: Viscosity, Artery, Perfusion

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viridianseal889

6 Apr 2017

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Pinlet anf poutlet difference make up the flow. If there is a flow moving down , the pressure is falling as moving down. It start from aorta than arteries (branches,) the pressure is falling. In aorta, large arteries the pressure is :100mmhg(memorize ) Venules, bigger veinules, smaller veins and big veins , vena cava :5mmhg. (memorize) The pressure move down through the vascular tree. Hydrostatic pressure is the pressure you get in fluid when the pressure is not moving (unlike in previous the blood is moving around) The pressure at the bottom : ?? (we want to know) A column of h20, 1 cm high the pressure is 1 cm h2o (we mean : the pressure here is the the column height (h) to the a on the earth ) same as 1 cm h2o) Multiply the 3 numbers (p*g*h) = 980 pa =0. 98k pa == 1 cmh2o ( just different unit )

Related Questions

When the heart pumps blood into the aorta, the pressuregradient-the difference between the blood pressure inside the heartand the blood pressure in the artery-is an important diagnosticmeasurement. A direct measurement of the pressure gradient isdifficult, but an indirect determination can be made by measuringthe Doppler shift of reflected ultrasound. Blood is essentially atrest in the heart; when it leaves and enters the aorta, it speedsup significantly and-according to Bernoulli's equation-the pressuremust decrease. A doctor using ultrasound of 2.5 MHz measures a 5400Hz frequency shift as the ultrasound reflects from blood ejectedfrom the heart.
Part A
What is the speed of the blood in the aorta? Assume that the speedof sound in human body is 1540 m/s
A:1.7 m/s
***Part B
What is the difference in blood pressure between the inside of theheart and the aorta? Assume that the patient is lying down and thatthere is no difference in height as the blood moves from the heartinto the aorta.

As an apple tree is transported by a truck moving left to rightwith constant velocity, one of its apples shakes loose and fallstoward the bed of the truck. What describes the path followed bythe apple, as seen by a stationary observer on the ground?

Since the apple, apple tree, and truck are all moving with constantvelocity, will the apple appear to move straight down? Or, will itfollow a curved path as if falling off the back of the truck? Idon't know why this is confusing me, but I can't make up my mindwhich would be correct. There are no diagrams, or additionalinformation given.

Chapter 3, Problem 70

A person looking out the window of a stationary train notices thatraindrops are falling vertically down at a speed of 3.10 m/srelative to the ground. When the train moves at a constantvelocity, the raindrops make an angle of 25Â° when they move pastthe window, as the drawing shows. How fast is the train moving?

PHGY 210 Lecture Notes - Lecture 3: Viscosity, Artery, Perfusion

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