Identifying Neurotransmitters 3) Produces response in postsynaptic cell - Qualifying condition: Molecules evoking same response as neurotransmitters Presynaptic- terminal Postsynaptic drite Drug-containing micropipette Apply drug by passing electrical Current Stimulate axon Record V Drug application through the micro-pipette Stimulated neurons Change in membrane potential AVm Outcome 1 Outcome 2 Outcome 3 -30 mV 15 mV 0 -15 mV -15 mV What is the interpretation of the above results?

Extracellular recordings create a distinct action potential. Choose the option that best describes the trace recording after stimulation.    1.The voltage trace becomes increasingly positive because the extracellular space becomes less negative 2.The voltage trace becomes increasingly positive because the extracellular space becomes less positive 3.The voltage trace becomes increasingly negative because the extracellular space becomes less positive 4.The voltage trace becomes increasingly negative because the extracellular space becomes more positive

Multiple answers may apply. +30. +10- 0 Threshold Membrane potential (mv) -10 30 -50 -70- -90 0 3 Time (msec) It is safe to say that in this stage (#5) of an action potential, OK+; closing Na+; closing OK+; opening ONa+; opening channels are

Place the following events in chronological order from 1-8: Nat enters the cell, and depolarization occurs to approximately +30 mV. The voltage across the cell membrane is -70 mV, the resting membrane potential. Upon reaching the peak of the action potential, the VG Nat channels are inactivated by the closing of their inactivation gate and the activation gate of each VG K channel opens. VG K channels close by the closing of their activation gate, and the resting membrane potential is gradually restored. An excitatory post-synaptic potential depolarizes the membrane to threshold and the activation gate of VG Nat channels open. Upon returning to the resting membrane potential, VG Na channels are reset by opening of the inactivation gate and the closing of the activation gate. VG K+ channels are slow to close, resulting in an excess of K* efflux and hyperpolarization. Depolarization occurs as K+ flows out of the cell.