Lab #3 - 4. Ether causes the threshold stimulus to go up,...

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Sylwester Czado 10-4-07 BIO 244, Lab #3 TA: Shannon Gerry Neuronal/ Reflex Worksheet 1. The three phases of an Action Potential are depolarization, repolarization, and hyperpolarization. Depolarization is when the interior becomes less negative due to positive ions coming in. The exterior becomes less positive. Repolarization is when the interior becomes more negative. Hyperpolarization is when the membrane becomes more negative than necessary. 2. A Motor Nerve: 3. Conduction velocity is greater in a myelinated nerve than in an unmyelinated nerve because a myelinated nerve insulates the electric current so it moves faster. They are good conductors of velocity because they are made up of lipids.
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Unformatted text preview: 4. Ether causes the threshold stimulus to go up, but it takes a long time for the nerve to return to normal. Therefore, you lose all basic motor function. Curare does not cause a single nerve to lose an electrical impulse, rather it cause subsequent nerves to lose the impulse. The effect of curare is that it paralyzes an organism (prey) by blocking the flow of electrical impulses between neurons. Lidocaine increases threshold stimulus so it prevents the membrane from losing an Action Potential. This is done for its anesthetic effects to relieve pain. 5. See attached sheet...
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