Resting Membrane Potential Quiz

-70 mV

Selective membrane permeability to K+ ions

It pumps 3 Na+ ions into the cell

<p>Voltage-gated channels</p> Signup and view all the answers

<p>-90 mV</p> Signup and view all the answers

<p>The Na+/K+-ATPase pump pumps 3 Na+ out of the cell and 2 K+ ions into the cell, contributing to the unequal distribution of ions across the cell membrane and helping to maintain the resting membrane potential.</p> Signup and view all the answers

<p>The unequal distribution of ions, with the membrane being more permeable to potassium ions (K+) than sodium ions (Na+), leads to more positive ions being pumped outside than inside, resulting in negativity inside and positivity outside the cell.</p> Signup and view all the answers

<p>The non-movable negatively charged proteins on the inner surface of the cell membrane contribute to the negativity inside the cell, as they cannot move due to their large size.</p> Signup and view all the answers

<p>Leak channels play a role in maintaining the resting membrane potential by allowing a slow leakage of ions, helping to stabilize the membrane potential.</p> Signup and view all the answers

<p>Voltage-gated channels are stimulated by changes in voltage and play a key role in generating and propagating action potentials in nerve cells.</p> Signup and view all the answers

<p>-70 mV</p> Signup and view all the answers

<p>-90 mV</p> Signup and view all the answers

<p>Unequal distribution of ions across cell membrane in extracellular fluid and cytoplasm due to selective membrane permeability, Na+/K+-ATPase pump, and intracellular non-movable negatively charged proteins.</p> Signup and view all the answers

<p>The Na+/K+-ATPase pump pumps 3 Na+ out of the cell and 2 K+ ions into the cell, contributing to the negativity inside and positivity outside the cell, thus maintaining the resting membrane potential.</p> Signup and view all the answers

<p>Leak channels allow the passive movement of ions, while gated channels, including voltage-gated and ligand-gated channels, are stimulated by changes in voltage or attachment of a substance, respectively, contributing to the electrical events in nerves.</p> Signup and view all the answers