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Luda [366]
3 years ago
7

Impedance plethysmography is a technique that can be used to detect thrombosis--the presence of clots in a blood vessel--by meas

uring the electrical resistance of a limb, such as the calf of the leg. In a typical clinical setting, a current of 200 μA is passed through the leg from the upper thigh to the foot. The voltage is measured at two points along the calf separated by 13 cm. Part A:
If the voltage measured is 17 mV, what is the resistance of the calf between the electrodes?

Part B:

If the average calf diameter between the electrodes is 12 cm, what is the average resistivity of this part of the leg?
Physics
1 answer:
likoan [24]3 years ago
4 0

Answer:

a) The resistance of the calf between the electrodes is 85\Omega

b) The average resistivity of this part of the leg is 57.81m\Omega/cm^{3}

Explanation:

Hi

a) Using Ohm's law V=IR, solving for R, we obtain R=\frac{V}{I}=\frac{17mV}{200uA}=85\Omega

b) The volume of the calf is like a cylinder, so Vol=\pi r^{2}h, with h=13cm and r=d/2=6cm, therefore Vol=\pi (6cm)^{2}(13cm)=468\pi cm^{3}. Then we can use R_{av}=\frac{R}{Vol} =\frac{85\Omega}{468\pi cm^{3}} =0.05781\Omega /cm^{3}=57.81m\Omega/cm^{3}, this is the average resistivity of this part of the leg.

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