L-04ActionPotential - Action Potential Review When...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
1/30/07 Action Potential Review: When Electrostatic gradient = concentration gradient, equilibrium Potassium is the most crucial ion to the RMP o Changing the extracellular K+ concentration changes the RMP The Action Potential o A rapid, transient change in voltage (depolarization) within the axon Initiated proximal to the soma Progresses all the way to the axon terminals o Ion channel A specialized protein molecule that permits specific ions to enter or leave the cell; specific for ion species o Voltage-dependent (or voltage-gated) ion channels An ion channel that opens or closes depending on the membrane potential, V m Subthreshold Stimulation o Stimulation that does not lead to an action potential (instead, called graded potential) o Changes in membrane voltage follow rules of passive current flow in the axon (cable properties: describe laws of current decay as length grows) Suprathrehold stimulation o Depolarization stimulus brings large enough change to start an action
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 04/09/2008 for the course PSYC 220 taught by Professor Brunges during the Spring '07 term at UVA.

Page1 / 2

L-04ActionPotential - Action Potential Review When...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online