33. In what way does the interior surface of a cell membrane in a resting neuron

Question

33. In what way does the interior surface of a cell membrane in a resting neuron differ from the exdemal a. The interior is positively charged and contains more sodium b. The interior is positively charged and contains less sodium C. The interior is negatively charged and contains more sodium d. The interior is negatively charged and contains less sodium. 34. Which of the following does not contribute to the resting membrane potential? a. calcium channels b. sodium-potassium pumps c. deferences in ionic makeutp 35. Which ion channels open in response to a change in membrane potential and participate in the generation and conduction of action potentials? a. mechanically gated channels b. votage-gated channels C leakage channels d. ligand-gated channels 38. Action potentials are propagated unidirectionally toward axon terminals because: a. action potentials decrease in magnitude over the distance. b. action potenials are always propagated in an anterograde fashion regardiess of conditions c. membranes become nonresponsive due to inactive sodium channels ater action potential generation d. action potentials are generated in the all-or-none manner 37. The point at which the all-or-none principle of action potential generation is reached is termed a the peak C, the point of no return d, the threshold 38. Saltatory conduction is made possible by a. myelin sheath b. large nerve fibers c, dghasic impulses d. erratic transmission of nerve impulses 39. Which of the following is not true regarding action potentials? a. Larger diameter foers have faster impulse conduction b. They travel more slowly on unmyelinated fibers. C. Na" influx causes depolarization. d. Stronger stimulation generates higher amplitude of action potentials 40. The presynaptic neuron releases neurotransmiters in response to an influx of a. sodium c. calcium d. sodium and potassium 41. Generation of an action potential can be inhibited by all of the following expept a. depolarization C, presynaptic nhbton d. inhibitory postsynaptic potential 42. Which of the folowing is not true regarding graded potentials? a. They are generated by ligand-gated channels b. They are typicaly presynaptic potentials. G. They are both excitatory and inhibitory d. They decrease in magnitude as they move away from the stimulus point.

Explanation / Answer

33 ans) d. The interior is negatively charged and contains less sodium

34 ans) a. Calcium channels

35 ans) b. Voltage gated channels

36 ans) c. Membranes become non responsive due to inactive sodium channels after action potential generation

37 ans) d. The threshold

38 ans) a. Myelin sheath

39 ans) d. Stronger stimulation generates higher amplitude of action potential

40 ans) c. Calcium

41 ans) a. Depolarization

42 ans) b. They are typically presynaptic potentials

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