# erythrocyte membrane

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1)Membrane lipids from 4.74*109 erythrocytes form a monolayer of 0.89 m2 in water. The surface area of an average erythrocyte is ~ 100 mm2. Show that the membrane is a bilayer.

2) How many moles of K+ will diffuse across the erythrocyte membrane in one minute under the following conditions:[K+]in = 100 mM

[K+]out = 15 mM

Surface Area of erythrocyte: 100 mm2 = 100*10-12 m2

Permeability P of K+ = 2.4*10-10 cm-sec-1

If the erythrocyte volume is 100 mm3, what percent of the internal K+ willl leak out in 1 minute?

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What aspect of that do you need help with? It's simple maths.

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• 2 weeks later...

1)Membrane lipids from 4.74*109 erythrocytes form a monolayer of 0.89 m2 in water. The surface area of an average erythrocyte is ~ 100 mm2. Show that the membrane is a bilayer.

2) How many moles of K+ will diffuse across the erythrocyte membrane in one minute under the following conditions:[K+]in = 100 mM

[K+]out = 15 mM

Surface Area of erythrocyte: 100 mm2 = 100*10-12 m2

Permeability P of K+ = 2.4*10-10 cm-sec-1

If the erythrocyte volume is 100 mm3, what percent of the internal K+ willl leak out in 1 minute?

you got it all figured out already

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