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Unformatted text preview: 4-11-08 The Nervous SystemCellular Aspects27.1. Schwann cells are unique in that theyA) do not have a nucleusB) have a plasma membrane made almost entirely out of lipidC) make food by photosynthesisD) are never found in the peripheral nervous systemE) none of the above27.2. _______________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 PopperB) Santiago Ramon y Cajal, Camillio GolgiC) Camillo Golgi, Santiago Ramon y CajalD) James Watson, Francis CrickE) Aristotle, Plato27.3. 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) antibodiesB) antigensC) enzymesD) substratesE) allergens27.4. The distribution of ions on the two sides of a membrane leads to a voltage across the membrane known as the______________.A) ionic potentialB) exocytotic potentialC) endocytotic potentialD) membrane potentialE) valence potential27.5. 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, negativeB) negative, positiveC) neutral, positiveD) negative, neutralE) negative, negative27.6. 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, polarizationB) hyperpolarization, depolarizationC) depolarization, hyperpolarizationD) depletion, repletionE) isopolarization, anisopolarization27.7. During an action potential along an axon in a human, the depolarization of the membrane initially causes:A) activation of sodium channelsB) inactivation of sodium channelsC) inactivation of calcium channelsD) inactivation of potassium channelsE) activation of chloride channels...
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- Fall '07