40) Which of the following ng statements most accurately describes what is happe

Question

40) Which of the following ng statements most accurately describes what is happening at the accurate here? the X on the diagram of the oscilloscope trace of an action potential shown +40 K'ions are flowing out of the cell a. 70 b. K ions are flowing into the cell Na* ions are flowing into the cell c. d. Na ions are flowing out of the cell 41) Suppose you administer a drug that efficiently removes Ca" ions. The effect of this drug on the nervous system would be to a. prevent an action potential from traveling along the axons b. prevent transmitter substance in the synaptic cleft from depolarizing the post-synaptic membrane c. inhibit the sodium/potassium pump d. prevent synaptic vesicles from discharging their contents into the synaptic cleft e. prevent transmitter substance from causing the depolarization of the presynaptic membrane 42) A drug that produces which one of the following effects would probably be least effective as a tranquilizer? a. Interferes with the uptake of noradrenalin into the synaptic vesicles b. Interferes with the synthesis of noradrenalin in nerve cells c. Blocks receptor sites for noradrenalin on the postsynaptic membrane d. Enhances the sensitivity of neurons to noradrenalir 43) The drug Lithium Carbonate is effective in the treatment of manic depression. Its action is to reduce the release of noradrenalin and enhance its reuptake. The effect of ingesting this drug would be to a. decrease the firing of the postsynaptic neuron at noradrenalin synapses b. enhance the sensitivity of the postsynaptic neuron to noradrenalin c. block receptor sites for noradrenalin on postsynaptic membranes d. slow down the rate of an action potential movement in the presynaptic neuron

Explanation / Answer

40) The answer is a. The x denotes falling phase where as voltage gated potassium channel opens, K+ ions diffuse out and this causes reversal of membrane potential. 41) d as it prevents neurotransmitter to release substances 42) c as uplifting of noradrenaline can reduce depression 43) c)

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