19 Which of the following is excitatory post synaptic potentials? a) they involv

Question

19 Which of the following is excitatory post synaptic potentials? a) they involve chemically regulated gates; b) Na and K gates open simultaneously; c) they exhibit refractory periods; d) they involve an initial depolarization; e) they are graded phenomena. 20 Which of the following would cause an inhibitory post synaptic potential? a) decrease in K' permeability; b) increase in extracellular concentration of Cl; c) increase in Na* permeability; d) decrease in extracellular concentration of Ca2; e) increase in Cl permeabili ty 21 Which of the following statements regarding the action potential is most accurate? a) sodium ions that flow into the propagation of an ell during one action potential diffuse and induce a new action potential in a neighboring membrane region; b) action potentials will propagate in all directions along an axon since sodium ions diffuse in all directions; c) sodium ions do not diffuse from the axon hillock into the perikaryon, thus ensuring one - way propagation of the action potential; d) action potentials propagate only toward cell membranes that are experiencing a refractory period; e) new action potentials are generated by depolarizations to -65 mv A postsynaptic cell a) must always be a neuron; b) possesses many synaptic vesicles near the synapse; c) releases neurotransmitter as a result of the influx of calcium; d) may possess receptor proteins that function as chemically regulated gates; e) always contains a membrane bound acetylcholinesterase 22. 23.The increase in excitability of a postsynaptic neuron following repeated stimulation is called a) inhibitory post synaptic potential; b) presynaptic inhibition; c) synaptic potentiation; d) excitatory post synaptic potential; e) neuromodulation 24. Biogenic amines a) are always found in the CNS; b) are never found in the CNS; c) are constructed from short chains of amino acids; d) are metabotropic (indirect) in function; e) include the neurotransmitter acetylcholine 25. Which of the following does not appear to be a structural class of neurotransmitter? a) acetylcholine; b) disaccharides; c) peptides; d) purines; e) peptides.

Explanation / Answer

Ans 19 :d) they involve an initial depolarization

The action potentials and excitatory postsynaptic potential are similar in the way that they both involve initial depolarization , which is caused due to inflow of positively charged ions in the cell.

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