Which of the following is (are) required to reestablish ion after the passage of

Question

Which of the following is (are) required to reestablish ion after the passage of an action potential? s- concentrations across the membrane a. The sodium/potassium ATPase pump. b. Voltage-gated Na" channels. c. Voltage-gated K channels. d. Voltage-gated Ca Channels. e. b and c Which of the following can be activated by a neurotransmitter that causes a depolarization of the postsynaptic membrane? 6- a. Ligand-gated Na Channels b. Voltage-gated Na" channels. c. Voltage-gated K channels. d. Voltage-gated Ca Channels. e. Ligand-gated Cl channels. 7- Which of the following can be activated by a neurotransmitter that causes a hyperpolarization of the postsynaptic membrane? a. Ligand-gated Nat Channels. b. Voltage-gated Na channels. c. Voltage-gated K' channels. d. Voltage-gated Ca Channels. Ligand-gated Cl channels. 8- Saltatory conduction occurs when e. a. Sodium ions levels are highest. b. Gated-sodium channels open. c. The resting potential fails to be reset. d. There is no synapse and the axon is continuous with the next dendrite. e. The action potential jumps from node to node on a myelinated axon. 9- An electrical synapse is mediated by a. Adherens junctions. b. Gap junctions. c. Tight junctions. d. A neurotransmitter. e. Desmosomes. 10-Delta is a membrane-anchored signal molecule that interacts with its receptor (Notch) on the surface of an adjacent cell; this type of communication is an example of a. Autocrine signaling b. Paracrine signaling c. Endocrine signaling d. Neuronal signaling e. Contact-dependent signaling II-Cancer cells often produce growth factors for which they also express the receptors:; thus, the engage in a sort of "signaling monolog" called a. Autocrine signaling b. Paracrine signaling c. Endocrine signaling d. Neuronal signaling e. Contact-dependent signaling

Explanation / Answer

Solution 8. Action potential jumps from node to node on a myelinated axon.

Solution9. Gap junctions

Solution 10. Contact--dependent signalling

Solution 11. Autocrine signalling

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