EP CAMPBELL BIO.IN FOCUS AP-MOD.MASTER.
EP CAMPBELL BIO.IN FOCUS AP-MOD.MASTER.
3rd Edition
ISBN: 9780137453092
Author: Urry
Publisher: SAVVAS L
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Chapter 37, Problem 4TYU

Why are action potentials usually conducted in one direction?

  1. A.    Ions can flow along the axon in only one direction.
  2. B.     Voltage-gated Na+ channels are inactivated during the refractory period.
  3. C.     The axon hillock has a higher membrane potential than the terminals of the axon.
  4. D.    Voltage-gated channels for both Na+ and K+ open in only one direction.
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The nerve impulses always travel in one direction from dendrites to axon terminals. What prevents an action potential from travelling backward? a. Hyperpolarization of the neuron makes the membrane more positive and prevents another action potential. b. After repolarization, the refractory period occurs, where the sodium ions are found outside the cell. c. After repolarization, the reversal of ions prevents another action potential as there would not be enough sodium ions outside the cell to rush in. d. The refractory period prevents another action potential by lowering the threshold potential.
The axon hillock of a neuron reaches the threshold of excitation and the membrane potential becomes completely reversed. Then, suddenly, the membrane potential begins to return to resting membrane potential. What is the event that triggers this return to resting potential?   A. Na+ channels close in a voltage-dependent manner   B. Na+ channels close in a time-dependent manner   C. Na+ channels close in a chemically-dependent manner   D. Na+ channels open in a voltage-dependent manner
What membrane protein of the neuron is responsible for briefly increasing the Na+ permeability of the membrane during the rising phase of the nerve impulse?  a. the sodium-potassium pump b. the voltage gated potassium channel c. the voltage gated sodium channel d. the stimulus gated sodium channel e. the ligand gated ion channel
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