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4_11_08_The_Nervous_System - The Nervous SystemCellular...

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4-11-08 The Nervous System—Cellular Aspects 27.1. Schwann cells are unique in that they A) do not have a nucleus B) have a plasma membrane made almost entirely out of lipid C) make food by photosynthesis D) are never found in the peripheral nervous system E) none of the above 27.2. _______________thought that the brain was made of a single multinucleate cell and _____________thought that the brain was made up of billions of cells. A) John Eccles, Karl Popper B) Santiago Ramon y Cajal, Camillio Golgi C) Camillo Golgi, Santiago Ramon y Cajal D) James Watson, Francis Crick E) Aristotle, Plato 27.3. Ion channels act as _____________that reduce the activation energy or thermal energy that would be necessary to move a charged ion through a hydrophobic lipid bilayer. A) antibodies B) antigens C) enzymes D) substrates E) allergens 27.4. The distribution of ions on the two sides of a membrane leads to a voltage across the membrane known as the______________. A) ionic potential B) exocytotic potential C) endocytotic potential D) membrane potential E) valence potential
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27.5. ln ([ion]out/[ion]in) is____________ when the outside concentration is greater than the inside concentration of an ion and _______________when the outside concentration is less than the inside concentration of an ion. A) positive, negative B) negative, positive C) neutral, positive D) negative, neutral E) negative, negative 27.6. A(n)__________________ of an electrically excitable cell like a neuron promotes an action potential and a(n) ______________ of the same cell inhibits an action potential. A) repolarization, polarization B) hyperpolarization, depolarization C) depolarization, hyperpolarization D) depletion, repletion E) isopolarization, anisopolarization 27.7. During an action potential along an axon in a human, the depolarization of the membrane initially causes: A) activation of sodium channels B) inactivation of sodium channels C) inactivation of calcium channels D) inactivation of potassium channels E) activation of chloride channels 27.8. Given the fact that the potassium concentration inside the cell is usually greater than
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