I\'m working on these two basic multiple-choice question on cell membranes. This

Question

I'm working on these two basic multiple-choice question on cell membranes. This is from my Advanced Physiology class.

Which of the following statements are true? Mark all that apply. A. Cell membranes can be permeable to some ions, but not others. B. The concentration of an ion outside a cell membrane can be greater than the concentration of the same ion inside the cell membrane because the electrical gradients are balanced. C. Each ion has its own equilibrium potential, independent of the presence of other ions. D. The Goldman Hodkin Katz equation solves for the equilibrium potential of a given ion. Channels control the permeability of ions across a cell membrane. Gated ion channels in neurons alternate between open and closed states to change ion permeability based on response to various stimuli. The video referred primarily to voltage-gated channels (i.e. Na+ and K+). Which of the following could also be a stimulus for an ion channel? Choose all that apply. A. Fine touch B. Esters C. Light (photons) D. Heat E. High sound frequencies

Explanation / Answer

4. All the factors mentioned here act as stimulus for ion channels. So the correct answers are A,B,C.D.E.

2. The first answer is incorrect. the cell membrane is permeable to all the ions but not equally permeable to all. The second answer is correct. The third answer is also correct. The fourth answer is incorrect. If more than one ion is responsible for membrane potential, then Goldman-Hodgkin-Katz equation is used for finding out the membrane potential.

So, the correct answers are B and C.

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