Question

blood vessel that has und a pressure of 7.6 15. Find the diffusion potential across a mem- brane if the K* concentration is 5 X 100 moles/cm on one side and 9.6 X 100 moles/cm on the other side. The K* concentration is 6 x 10-6 moles/cmº in the intracellular fluid and 1.2 x 10- moles/cm inside of a cell. Find the dif- fusion potential. lood vessel that has d a pressure of 7.3 esistance in 6 RRIT

Answer 1

15. Diffusion potential - caused by diffusion of ions. A diffusion potential can be generated only if the membrane is permeable to that ion. so, if the membrane is not permeable to the ion, no diffusion potential will be generated no matter how large a concentration gradient is present.

Diffusion potential = -61log concentration outside /concentration inside

Diffusion potential of potassium = -61log 5× 10-6moles / cm3 / 9.6× 10-6 moles/ cm3

16. Diffusion potential = - 61log concentration outside / concentration inside

= -61log 6× 10-6moles /cm3 / 1.2 × 10-5 moles /cm3