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Blood pressure. Systemic blood pressure is expressed as the ratio of the systolic pressure (when the heart first ejects blood into the arteries) to the diastolic pressure (when the heart is relaxed):systemic blood pressure $=\frac{\text { systolic pressure }}{\text { diastolic pressure }}$Both pressures are measured at the level of the heart and are expressed in millimeters of mercury (or torr), although the units are not written. Normal systemic blood pressure is $\frac{120}{80}$ . (a) What are the maximum and minimum forces (in newtons) that the blood exerts against each square centimeter of the heart for a person with normal blood pressure? (b) As pointed out in the text, blood pressure is normally measured on the upper arm at the same height as the heart. Due to therapy for an injury, a patient's upper arm is extended 30.0 $\mathrm{cm}$ above his heart. In that position, what should be his systemic blood pressure reading, expressed in the standard way, if he has normal blood pressure? The density of blood is 1060 $\mathrm{kg} / \mathrm{m}^{3}$ .

a) 1.0664$N$b) $\frac{96.62}{56.61}$

02:36

Elan S.

Physics 101 Mechanics

Chapter 13

Fluid Mechanics

Temperature and Heat

Evelyn P.

December 3, 2020

Cornell University

University of Washington

Simon Fraser University

University of Winnipeg

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systemic blood pressure is expresses the ratio of systolic pressure to diastolic pressure. So both pressures are measured at the level of the heart and are expressed in millimeters of mercury. Although the units are not usually written normal systemic Blood pressure is 120 over 80. What are the maximum and minimum forces that the blood exerts against each square centimeter of the hard for a person with normal blood pressure. In part b, blood pressure is normally measured on the upper arm, the same height as the heart. due to therapy for an injury. A patient's upper arm is extended 30 cm above their heart in that position. What would be their systemic blood pressure reading expressed in the standard way if they have normal blood pressure and then they tell us the density of blood is 1060 km/m cubed. Okay, so normal pressure, atmospheric pressure Brennan is 760 millimeters of mercury, Which is a 101.3 times 10 to the three newtons per meter squared. So this is something that can be looked up. So diastolic pressure is 80 of mercury, so 80 millimeters Times 101.310 to the three newton's over meters squared Over 716 mm. So this is our unit measurement. So the diastolic pressure is at 1.07, It's into the 4th. Newtons per meter squared. And the systolic pressure peace best Is 120 times this unit. So 1.6 10 to the force. Newton per meter squared. And we also know the area is one square centimeter Which is 10 to the negative force meters squared. Okay, so knowing all of this, we can start with the minimum force. So is the diastolic pressure times the area, Which is 1.07 newtons. The maximum force is systolic times the area Which is 1.6 newtons. Well. Okay, let me just repeat that. So The maximum force is this stolid pressure times the area which is 1.6 newtons and Or part C. We know that H. is 30 cm above the heart. So the systolic pressure for part C. P. Primes of S. Is 120 minus H. Roe Oguro is the density of blood. So solving We no H. is 30 cm. We know the density. We know G as a constant. So this gives us 96.6 mm of Mercury and same thing for diastolic. This gives us It's AT -H. P. G., which is 56.6 millimeters.

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