Neurophysiology Lecture Quiz: Excitability and Ion Channels

Channel activation or gating mechanisms

Resting/deactivated, Activated, Inactivated

Entry of Na+ ions

<p>Opening of K+ channels</p> Signup and view all the answers

<p>Na+ channels need to open to initiate an action potential</p> Signup and view all the answers

<p>Na+ ions move towards equilibrium, changing the balance of charges across the membrane</p> Signup and view all the answers

<p>Ions flowing through ion channels in excitable membranes</p> Signup and view all the answers

<p>Changes in Na+, K+, and Ca++ concentrations lead to depolarization and repolarization seen in the ECG.</p> Signup and view all the answers

<p>Ion channels allow current flow across the membrane, increasing flow when open.</p> Signup and view all the answers

<p>The presence of ion channels and ionic gradients make a membrane excitable.</p> Signup and view all the answers

<p>The membrane potential is the result of electrical and chemical gradients across the cell membrane, allowing for the movement of ions.</p> Signup and view all the answers

<p>Ion channels can activate, deactivate, and modulate, allowing for the controlled flow of ions and changes in membrane potential.</p> Signup and view all the answers

<p>Permeability to K+</p> Signup and view all the answers

<p>Phase 0</p> Signup and view all the answers

<p>Inward current through slowly activating and inactivating voltage-gated Ca++ channels.</p> Signup and view all the answers

<p>Inactivation of Na+ channels</p> Signup and view all the answers

<p>Inactivation of Ca++ channels and increase in permeability to K+</p> Signup and view all the answers

<p>Due to the disruption of the ionic balance and potential effects on action potentials in the heart.</p> Signup and view all the answers