Review Questions for Chapter 3 Answer Key

Review Questions for Chapter 3 Answer Key - Review...

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Sheet1 Page 1 Review Questions for Chapter 3 Answer Key Review Questions from the textbook 1 What two functions do proteins in the neuronal membrane perform to establish and maintain the resting membrane potential? Proteins in the neuronal membrane Make up ion channels that control the movement of specific ions across the neuronal membrane Pump sodium and potassium ions across the membrane against their concentration gradients to maintain the resting membrane potential 2 On which side of the neuronal membrane are Na+ ions more abundant? Na+ is more concentrated on the outside 3 When the membrane is at the potassium equilibrium potential, in which direction (in or out) is there a net movement of potassium ions? There is no net movement of potassium at the potassium equilibrium potential. By definition the equilibrium potential for an ion is the voltage where the chemical (diffusion) force and the electrical force are equal and opposite. 4 There is a much greater K+ concentration inside the cell than outside. Why then is the resting membrane potential negative? It is negative because negatively charged anions were left behind when some potassium ions diffused outside the cell. Still there are more potassium ions inside the cell than outside at the resting membrane potential. Most of the solution inside and outside the cell is electrically neutral because the positive
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This homework help was uploaded on 04/03/2008 for the course NEUROBIOLO Fund Neuro taught by Professor Schjott during the Spring '08 term at Rutgers.

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Review Questions for Chapter 3 Answer Key - Review...

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