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Question

We have finally discovered life on Venus. NASA scientists are investigating a newly discovered life form: a single-celled organism found in the swampy canals. You have been contracted by NASA to perform an electrophysiology study. Using intracellular electrodes to measure the electrical charge inside the cell, you find it has a resting membrane potential of -45 mV when the outside fluid is arbitrarily set to 0 mV. Additionally, you have determined ion concentrations and listed them below.

[ ] in mOsm/L   Cell   Swamp
K+   5   150
Na+   15   175
Cl-   40   40

For fun, you have used new molecular biology techniques to insert protein channels into the cell membrane that allow only Na+ and Cl- to pass. Predict which ion(s) will move. Tell what direction it (they) will move and what force(s) is/are acting on it (them).

Answer

15 Seconds

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