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14 Cards in this Set
- Front
- Back
1. Some dendrites contain additional short outgrowths. What are these outgrowths called? d. Myelin sheaths. |
b. Dendritic spines. |
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2. Incoming synapses are primarily found on a. Dendrites only. c. Axons only. |
d. Dendrites and cell bodies. |
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3. Nodes of Ranvier are d. Responsible for cell metabolism. |
a. Gaps in the myelin of axons. |
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4. A neuron can have any number of _______ and only one __________? |
d. Both a and c are correct |
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5. Which type of glial cells remove waste material in the nervous system? d. Radial glia. |
a. Astrocytes. |
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6. ___________ in the brain and spinal cord (CNS) and c. Microglia; Oligodendrocytes. |
a. Oligodendrocytes; Schwann cells. |
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7. When the neural membrane is at rest, the sodium channels a. Permit Na+ to pass quickly and easily. |
c. Are closed. |
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8. The concentration gradient refers to b. The fact that the concentration of ions is greater on the outside of a neuron. |
c. The difference in distribution for various ions between the inside and outside of the membrane. |
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9. Electrical gradients lead to what kind of movements? |
d. The movement of ions to areas having the opposite electrical charge. |
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10. A membrane produces an action potential whenever the potential across it reaches what level? b. -90mV. |
c. The threshold of excitation. |
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11. Hyperpolarization is |
a. Increased polarization. |
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12. At what point do the Na+ channels begin to close? |
a. At the peak of the action potential. |
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13. Which of the following would depolarize a neuron? a. Decreasing the membrane’s permeability to Ca2+. b. Increasing the membrane’s permeability to K+. |
d. Increasing the membrane’s permeability to Na+. |
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14. A drug that decreases the flow of K+ through the membrane would a. Block action potentials. |
c. Slow the return of the membrane to its resting state. |