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Physiology Practice Test: Nerve Cells and Electrical Signaling
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Physiology Practice Test: Nerve Cells and Electrical Signaling
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25 Questions

1. The GHK equation is used to calculate the equilibrium potential for a specific ion.
2. The time between action potentials is directly determined by the ________ the graded potential at the axon hillock.
3. Under resting conditions, the sodium channel responsible for generating an action potential is closed and incapable of opening.
4. Which of the following is located in the autonomic nervous system?
5. What percentage of people with diabetes develop peripheral neuropathy?
6. The membrane potential of a cell is determined exclusively by that cellʹs sodium and potassium permeability.
7. For the sodium channel to open and allow sodium into the cell, ________.
8. The repolarization phase of action potentials in neurons is due primarily to ________.
9. Schwann cells are the only glial cells in the peripheral nervous system.
10. What is the functional unit of the nervous system?
11. Effector organs act as receptors that detect information about the external environment and transmit that information to the central nervous system.
12. The patterns of change in ion channel permeability that occur during an action potential are due to ________ gating of voltage-sensitive potassium and sodium channels.
13. The direction of change in membrane potential, in response to a stimulus that initiates a graded potential, is dependent upon ________.
14. Which of the following statements is FALSE?
15. Which of the following cells is NOT classified as a glial cell?
16. Which of the following is the correct term for the movement of an electrical charge across a membrane?
17. As a membraneʹs permeability to a particular ion increases, membrane potential will move ________ that ionʹs ________.
18. Stimuli A and B are both suprathreshold stimuli that last for one second, but stimulus A is stronger. Which of the following statements is TRUE?
19. Excitatory graded potentials are those where the stimulus initiates a hyperpolarization of the cell.
20. An action potential originates at the ________ and travels along the axon until it reaches the ________.
21. If the graded potential remains above threshold once it reaches the ________, an action potential will be generated.
22. The depolarization phase of the action potential is generated by a rapid ________.
23. The number of ions whose movement across the membrane creates the resting membrane potential are so few that their movement does not affect that ionʹs concentration gradient.
24. Which of the following is NOT a factor involved in the determination of resting membrane potential?
25. The Na+/K+ pump is called an electrogenic pump because the imbalance between ________.

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