5. What will be the blood flow in l/min if the injection rate of 4 mg/min result

Question

5. What will be the blood flow in l/min if the injection rate of 4 mg/min results in a downstream concentration of 1 mg/l? 8. A pipeline of 0.2 m in diameter is flowing with water and ends in a constricted pipe of 0.1 m diameter. If the velocity in the 0.2 m section is 2 m/sec, find the velocity and the flow rate in the constricted section. 9. A patient has a 10 l/min CO. His PA has a 15 mm diameter with a 20 mm Hg pressure. His LA pressure is 8 mm Hg. Calculate the pulmonary vascular resistance. 13. Determine the Reynold's number when the water flows in a tube of 1 cm diameter with a velocity of 10 cm/sec. The density of water is 1 g/cm3 and its viscosity is 0.01 dyne-sec/cm2. One dyne is the force that imparts an acceleration of 1 cm/sec/sec to a mass of 1 g (that is, the unit of dyne is (g)(cm)/sec2).
5. What will be the blood flow in l/min if the injection rate of 4 mg/min results in a downstream concentration of 1 mg/l? 8. A pipeline of 0.2 m in diameter is flowing with water and ends in a constricted pipe of 0.1 m diameter. If the velocity in the 0.2 m section is 2 m/sec, find the velocity and the flow rate in the constricted section. 9. A patient has a 10 l/min CO. His PA has a 15 mm diameter with a 20 mm Hg pressure. His LA pressure is 8 mm Hg. Calculate the pulmonary vascular resistance. 13. Determine the Reynold's number when the water flows in a tube of 1 cm diameter with a velocity of 10 cm/sec. The density of water is 1 g/cm3 and its viscosity is 0.01 dyne-sec/cm2. One dyne is the force that imparts an acceleration of 1 cm/sec/sec to a mass of 1 g (that is, the unit of dyne is (g)(cm)/sec2).
5. What will be the blood flow in l/min if the injection rate of 4 mg/min results in a downstream concentration of 1 mg/l? 8. A pipeline of 0.2 m in diameter is flowing with water and ends in a constricted pipe of 0.1 m diameter. If the velocity in the 0.2 m section is 2 m/sec, find the velocity and the flow rate in the constricted section. 9. A patient has a 10 l/min CO. His PA has a 15 mm diameter with a 20 mm Hg pressure. His LA pressure is 8 mm Hg. Calculate the pulmonary vascular resistance. 13. Determine the Reynold's number when the water flows in a tube of 1 cm diameter with a velocity of 10 cm/sec. The density of water is 1 g/cm3 and its viscosity is 0.01 dyne-sec/cm2. One dyne is the force that imparts an acceleration of 1 cm/sec/sec to a mass of 1 g (that is, the unit of dyne is (g)(cm)/sec2).

Explanation / Answer

5)blood flow=injection rate/downstream conc=4/1=4

8) AV constant

[(0.2)2/4]x2=[x(0.1)2/4]xv

v=8 m/s

flow rate=Q=AV=[(0.2)2/4]x2=0.02

9)PVR = 80*(PAP – PCWP)/CO,

PVR=80*(20-8)/10=96dyn·s·cm5

13)reynold's number=(density)(velocity)(diameter)/(viscosity)

reynold's number=1*10*1/0.01=1000

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