Don\'t mind my circling and highlighting. I want to know which one is correct. 2

Question

Don't mind my circling and highlighting. I want to know which one is correct.

26. In saltatory conduction, the Nodes of Ranvier: A) are the sites of cross-membrane current flow B) lack voltage-gated ion channels. c) are incased in a myelin sheaf. D) are electrical synapses. E) inhibit the Hodgkin cycle 27. The molecular basis for the relative refractory period is Al voltage gated K channels are still open in the membrane. B) Na activation gates are still open in the membrane. C) Nat inactivation gates are still closed. D) voltage gated Ca2* channels are still open in the membrane. E) voltage gated K are inactivated. 28. An EPSP results when: A) post-synaptic potential is more negative than threshold potential. B) post-synaptic potential is more positive than threshold potential C) post-synaptic potential is equal to threshold potential. D) post-synaptic chloride channels are activated. E) post-synaptic Na*/Kare activated. 29. At a given body temperature, the equilibrium potential described by the Nernst equation for a specific ion: A) depends on membrane conductance to the ion. B) depends on the mass of the ion (C) depends on the concentration gradient across the membrane. D) prevents electrochemical equilibrium. E) is always negative. 30. Integrated graded post-synaptic potentials caused by neurotransmitter release are: A) encoded as the magnitude of action potential generated in the post-synaptic neuron. B) encoded as the frequency of action potentials generated in the post-synaptic neuron. C) encoded as the change in Nat concentrations in the post-synaptic neuron. D) encoded as the degree of G-protein activation E) encoded as the magnitude of the depolarization of the pre-synaptic neuron. 31. Transient changes in membrane potential which vary in magnitude and are responsible for sending signals over relatively short distances are known as: A) reversal potentials Bequilibrium potentials C) graded potentials D) action potentials E) wasted potentials 32. In a typical neuron the action potential is initiated at the A) dendrites B) cell body C) axon hillock D) axon terminals E) synaptic cleft

Explanation / Answer

26- A are the sites of cross membrane current flow.

27- C Na+ inactivation gates are still closed

28- A when post synaptic potential is more negative than threshold potential.

29- C depends on concentration gradient of ions across membrane

30- A

31- C

32- C

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