BIOLOGY CONNECT ACCESS CARD 1-SEMESTER
BIOLOGY CONNECT ACCESS CARD 1-SEMESTER
12th Edition
ISBN: 9781264019090
Author: Raven
Publisher: MCG/CREATE
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Chapter 42, Problem 1S

Tetraethylammonium (TEA) is a drug that blocks voltage-gated K+ channels. What effect would TEA have on the action potentials produced by a neuron? If TEA could be applied selectively to a presynaptic neuron that releases an excitatory neurotransmitter, how would it alter the synaptic effect of that neurotransmitter on the postsynaptic cell?

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John Hughes and Hans Kosterlitz identified the endorphin receptor in frogs, and concluded that animals have a "built in" opioid system. To make sure that endorphins are truly neurochemicals, which of the following question should we ask these gentlemen? Please select all that apply.a) Are endorphins released in response to presynaptic depolarization? b) Do endorphins interact with postsynaptic receptors? c) Are endorphins found in presynaptic cells? d) Are endorphins subject to reuptake?
Some postsynaptic synapses are called silent synapses due to the lack of AMPA receptors. Why do those synapses not have a synaptic response at the resting membrane potential? Explain under what conditions you would still be able to detect a postsynaptic response from those silent synapses.
When an inhibitory neurotransmitter such as GABA opens cl– channels in the plasma membrane of a postsynaptic neuron, why does this make it harder for an excitatory neurotransmitter to excite the neuron?
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