Equilibrium (simple editor) Flashcards
<p>Sodium (Na)/Potassium(K) pump</p>
<p>ATP powered pump drives concentration gradients of ions across membrane. Builds and maintains potassiums concentration gradient in neurons.75% of all ATP powers the Na+/K+ pump. K+ in, Na+ out.</p>
<p>concentration gradient</p>
<p>is the process of particles, which are sometimes called solutes, moving through a solution or gas from an area with a higher number of particles to an area with a lower number of particles. The areas are typically separated by a membrane</p>
<p>When will potassium stop leaving the cell?</p>
<p>when the force of the concentration gradient is equal and opposite of the electrical gradient.</p>
<p>electrical gradient</p>
<p>refers to the electrical potential that acts on an ion to drive the movement of the ion in one or another direction</p>
<p>What is the equilibrium potential?</p>
<p>The membrane potential at which the force of an ion's concentration gradient is equal and opposite to the ion's electrical gradient.</p>
<p>What are ions always trying to do in a cell?</p>
<p>Ions is are always trying to drive the cell to the equilibrium potential for that ion.</p>
<p>When an ion channel opens (any ion channel), Allowing an ion to flow, It will flow until It gets to its \_\_\_\_\_\_\_\_\_\_?</p>
<p>Equilibrium potential</p>
<p>Add its own particular Equilibrium potential, The ion is in equilibrium. So what does that mean in regards to the current or net flow?</p>
<p>There will be no current and no net flow.</p>
<p>How do neurons generate a membrane potential?</p>
<p>Ions themselves can generate a voltage difference across the membrane if:(1)There is concentration gradient (Difference in concentration in versus out)(2)There is a selective ion channel that allows The ion to flow by itself.</p>
<p>Why is the cell negative when there is a high concentration of K+ ions inside the cell? Shouldn't that make the inside of the cell more positive?</p>
<p>It's all about what potassium leaves behind in the cell as it flows down its concentration gradient. (negative anions)</p>
<p>How do you calculate the equilibrium potential?</p>
<p>Use the Nernst equation.</p>
<p>Explain the equilibrium potential of potassium.</p>
<p>Potassium is a positive ion. When the concentration of potassium is high inside the cell, It's equilibrium potential is negative because you would need to get the cell to be negative in order to stop potassium from flowing out.</p>
<p>What builds and maintains potassiums concentration gradient in neurons?</p>
<p>Sodium/potassium pump</p>
<p>Define equilibrium for an ion (within the context of the neuronal membrane). Your answer should mention forces.`</p>
<p>An ion is at equilibrium when the force of its concentration gradient is equal and opposite to the force of it's electrical gradient.</p>
<p>What's the purpose of an ion channel?</p>
<p>To provide a pathway for charged ions To flow across the membrane</p>
