1- A sodium channel opens up for a singular millisecond in a cell. Model this as
ID: 3480244 • Letter: 1
Question
1- A sodium channel opens up for a singular millisecond in a cell. Model this as 10 seconds in your macroscale node, bringing ions (beads) in one at a time. Note that your membrane potentials will have changed.
a.Compared to the resting potential, is the intracellular area of the node more positive or more negative than it was before? Explain how you know.
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2-Repeat the above steps for potassium, keeping your sodium ions in the same ending location as the above step.
a.Is the intracellular area now more negative or positive than it was before opening the potassium channel? Explain how you know.
Explanation / Answer
ANS 1) As it seems, most resting neurons are permeable to na+ believe that na+ is the most effective ion that may cross the membrane. gift at a miles higher concentration outdoor of a mobile than inside, it's going to flow down its awareness gradient into the cellular, making the interior of the cellular high-quality relative to the outdoor.
due to this, the sodium equilibrium ability—the electric potential difference throughout the cellular membrane that precisely balances na+ might be high quality. so, in a system in which na is the simplest permeant ion, the membrane ability will be high-quality.
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ANS 2) in a neuron, the resting membrane potential is toward the potassium equilibrium capability than it's far to the sodium equilibrium capability. this is because the resting membrane is plenty more permeable to k+. if greater potassium channels have been to open up—making it even less complicated for K the membrane would hyperpolarize, getting even in the direction of the potassium equilibrium capacity. if potassium channels in the membrane open. if potassium channels begin to circulate down its awareness gradient and out of the mobile. on every occasion a K+ion leaves the mobile, the cellular's interior loses a positive fee. due to this, a moderate excess of positive price builds up on the out of doors of the mobile membrane, and a moderate excess of negative charge builds up at the interior. that is, the inside of the cellular becomes terrible relative to the outdoor, putting in a difference in electrical capacity across the membrane.
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