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A needle of inner diameter 0.50mm is used to draw blood from a patient’s arm for...

A needle of inner diameter 0.50mm is used to draw blood from a patient’s arm for a medical test. The average blood pressure in the patient’s arm is 85mmHg, and the viscosity of the blood is 3.5×10−4Pa⋅s. The length of the needle is 6.0cm, and the blood needs to be drawn at a constant flow rate of 0.10cm3/s. What pressure must be applied to the plunger?

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Answer #1

Blood flow rate

Change in pressure

Where

Blood pressure in patient's arm is

Pressure applied to the plunger is

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