4_11_08_The_Nervous_System - 4-11-08 The Nervous...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

Page1 / 7

4_11_08_The_Nervous_System - 4-11-08 The Nervous...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online