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17 Cards in this Set
- Front
- Back
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What was the purpose of cutting the legs and the proboscis in the fly on the first video? |
In order to provide a clearer picture of the fly, and to prevent interference when being viewed under the microscope [video 1: 2:50-2:53] |
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What compound was used as an anesthetic for the fly in order to put it to sleep? |
CO2(Carbon dioxide) [video 1; 1:36] |
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True or false: the only region in which an insect has pain receptors is in the thorax |
False. Insects do not feel pain [video 1; 3:44] |
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How would a person determine the magnitude of a potential (how large) that is necessary in order to balance a given potassium concentration difference across a membrane? |
Necessary potassium potential depends on the difference between the logarithmic function of the inner concentrations and outer concentrations, given by the equation: Ek=(ln[k]0- ln[k]i) p. 73 |
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What is the purpose of the Nernst equation (why is it useful)? |
It's a general equation that helps to determine the equilibrium potentials for ions, discovering when membranes will be at rest p. 73 |
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Should the Nernst equation be written with an activity ratio or a concentration ration? |
Activity ratio p.73 |
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Does this picture represent the response signal or the background noise? |
Response signal (video 2; 3:54) |
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True or False: When isolating H1, you always hear it before you see it. |
True (video 2; 1:31) |
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Cell direction is ______________, which means that it will only fire when the pattern moves from left to right. |
Selective (video 2;1:13) |
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What specific type of energy doe cells use to maintain the ionic composition of the cytoplasm? |
Metabolic energy p. 75
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When the cell membrane is made more negatively charged, does the inward current increase or decrease slowly with hyper polarization? |
Increase p.75 |
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What specific idea about concentration movement formed the basis about early ideas of ion permeation, but no longer provides an adequate description of the permeation process? |
Diffusion p. 75 |
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What relation is used to measure conductance in box 4.1? (Hint. Equation) |
Conductance=I/(V-V0) |
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What specific measurement does conductance downed on? |
Concentration p. 74 box 4.1 |
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The slope conductance is useful for: |
Specifying conductance by measuring the slope of the current-voltage relationship (d1/dV) at the point of interest p.74 box 4.1 |
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The potential that balances the potassium concentration gradient is called the------- |
Potassium equilibrium potential p.73 |
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What does the current of potassium within a channel depend on? |
The electrical potential across a membrane and the potassium concentration gradient p.73 |
