Question 1 Multiple Choice 0.5 points You dissect a frog muscle with its motor nerve intact and place it in a chamber filled with Ringer, a solution which approximates the normal ionic composition of extracellular fluid. You position two stimulating electrodes on the preparation, one on the nerve and the other directly on the muscle. Stimulating via either electrode causes muscle contractions. What would happen if you applied a toxin that blocked voltage-gated Ca++ channels? The muscle would continue to contract normally when stimulated at either location. The muscle would contract when stimulated directly, but not via the nerve. The muscle would contract when stimulated via the nerve, but not directly. The muscle would not contract when stimulated at either location. Question 2 Multiple Choice 0.5 points Which one of the following would cause an immediate increase the amplitude of the EPSP at a typical chemical synapse? increasing the rate of re-uptake of neurotransmitter into the presynaptic terminal
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This note was uploaded on 10/25/2010 for the course BISC 220L taught by Professor Herrera,mcclure during the Spring '07 term at USC.