10. Which of the following choices best completes the following statement (circl

Question

10. Which of the following choices best completes the following statement (circle all that apply)_"When a neuron re turns to its resting potential a. the synapse collapses b. a sodium pump pumps out sodium c, a potassium pump pumps out d. a voltage-gated sodium pump lets sodium in, e. a voltage-gated potassium pump lets potassium in; f. a Na+/K+ exchange pump turns off, g. a Na+/K+ exchange pump turns on potassium 34. Which of the following best defines a voltage-gated channel? A protein that functions as an ion pump An ATP activated protein that lets ions through the membrane A protein that binds neurotransmitters and lets ions into the cell The space that connects electrically-coupled neurons A protein that changes shape in an electric field to let ions in A molecular motor that generates an electric field a. b. c. d. e. f. 35. Which 1 of the following choices best completes the following statement: When a neuron is stimulated, the first thing to happen is that. a. the whole neuron depolarizes b. the whole neuron hyperpolarizes c. the post-synaptic cytoplasm depolarizes d. the post-synaptic cytoplasm hyperpolarizes e. potassium rushes into the neuron f. potassium rushes into the post-synaptic cytoplasm g. the post-synaptic membrane releases glutamate

Explanation / Answer

(10) option g

Sodium-potassium ATPases redistribute K+ and Na+ ions until the membrane potential is back to its resting potential

(34) option e

A protein that changes shape in an electric field to let ions in

(35)

The whole neuron depolarizes

When a neuron is stimulated, sodium ion enters and cause the depolarization. Action potentials occur when the neuron is stimulated (depolarized)

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