When a nerve cell depolarizes, charge is transferred across the cell membrane th

Question

When a nerve cell depolarizes, charge is transferred across the cell membrane through neurotransmitters. For a typical nerve cell, 9.0 pC of charge flows in a time of 0.5 ms. Calculate the average current of the discharge. If the average potential difference across the membrane is |50 mV|, calculate the average power P delivered by the cell, The femoral artery is the large artery that carries blood to the leg. A person's femoral artery has an inner diameter of 1.0 cm. What is the resistance of a 20-cm-long column of blood in this artery?

Explanation / Answer

A. current Average I = charge/time

I = Q/t = 9 *10^-12/(0.5*10^-3)

I = 1.8*10^-8 Amps

B. Power P = Vi

P = 50*10^-3 * 1.8*10^-8

P = 9*10^-10 Watts

P2:

Resistance R = rho L/A

rho is resistiivty of blood   =

so

R = 1.6 * 0.2/(3.14 * 0.005* 0.005)

R = 4076.43 ohms

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