Unit Quiz4 1 potassium leaves the cell sodium enters the cell cell depolarizes stimulus moves voltage above threshold sodium-potassium pump restores resting potential voltage-gated sodium channels open voltage-gated sodium channels close and voltage-gated potassium channels open cell hyperpolarizes voltage-gated potassium channels close
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Madhur L.
The action potential is a transient change in the resting membrane potential from -70 mV to +30 mV, then back to -70 mV. This change is caused by the opening of first _ then voltage-gated channels. Na+ then K+ What area(s) of the neuron first generate signals that open the voltage-gated channels in the first part of the axon? The axon hillock, Axon collaterals, Dendrites and cell body. As the axon hillock depolarizes, Voltage-gated Na+ channels open and Na+ moves (into or out of) the cell causing further (depolarization or repolarization). out of; depolarization into; repolarization out of; repolarization into; depolarization If depolarization reaches -55 mV, an action potential will be generated. What is this -55 mV trigger point called? Threshold At the end of the depolarization phase, what voltage-gated channels open to help restore the resting membrane potential? Voltage-gated K+ channels. Repolarization is caused by the movement of what ion (sodium or potassium), in what direction (into or out of the cell)? potassium; out of the cell sodium; into the cell After an action potential, the membrane becomes more negative than -70 mV. This period is called hyperpolarization.
Sri K.
1. What is the correct net result of 1 full cycle of the Na+ K+ pump? Group of answer choices 3 K+ pumped out of the cell, 2 Na+ pumped into the cell, 1 ATP split 2 K+ pumped out of the cell, 2 Na+ pumped into the cell, 1 ATP split 3 Na+ pumped out of the cell, 2 K+ pumped into the cell, 2 ATP split 3 Na+ pumped out of the cell, 3 K+ pumped into the cell, 1 ATP split 3 Na+ pumped out of the cell, 2 K+ pumped into the cell, 1 ATP split 2 K+ pumped out of the cell, 3 Na+ pumped into the cell, 1 ATP split 2. Where do you find the highest concentration of i. Na+ ions [ Select ] ["outside of the cell", "inside of the cell", "the correct answer is not listed"] ii. K+ ions [ Select ] ["the correct answer is not listed", "inside of the cell", "outside of the cell"] iii. Ca++ ions ["the correct answer is not listed", "inside of the cell", "outside of the cell"] 3. What causes a voltage-gated ion channel to open? Group of answer choices Physical pressure applied to the cell containing the ion channel. A concentration gradient. Splitting an ATP. The binding of a ligand. A change to the electrical charge in the adjacent membrane.
Megan B.
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