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Review Questions Chapter 4 Answer Key

Review Questions Chapter 4 Answer Key - Review Questions...

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Sheet1 Page 1 Review Questions Chapter 4 Questions from Textbook Define membrane potential (VM) and sodium equilibrium potential (ENa). Which of these, if any, changes during the course of an action potential? The membrane potential (VM) is the voltage across the membrane at any moment in time. The membrane potential does change during the course of an action potential. The sodium equilibrium potential is the steady equilibrium potential achieved when the membrane is permeable only to sodium. The value of ENa is +62 mV, when there is a 10:1 ratio of sodium outside: inside, but the value changes if the concentration of sodiumoutside and inside changes. ENa does not change during potential. What ions carry the early inward and late outward currents during the action potential? Sodium ions carry the early inward current. Potassium ions carry the late outward current. If an action potential occurs it always reaches the peak, there are no partial action potentials. For an action potential to occur the depolarization must reach threshold, or else it will not happen at all.
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