106L04_5_slides

106L04_5_slides - Introduction Introduction to Neuroscience...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Introduction to Neuroscience Lecture 4 & 5: The Action Potential Reading Assignment: Bear et al., Chapter 4. CBNS 106 2 Introduction • Action Potential in the Nervous System – Conveys information over distances – Cytosol has negative charge relative to extracellular space – Neural code - frequency and pattern – Action potential • Spike • Nerve impulse • Discharge CBNS 106 3 Properties of the Action Potential • The Ups and Downs of an Action Potential – Oscilloscope to visualize an AP • Rising phase, overshoot, falling phase, and undershoot CBNS 106 4 Properties of the Action Potential • The Generation of an Action Potential – “All-or-none”: Cross threshold value for action potential – Chain reaction • e.g., Puncture foot, stretch membrane of nerve fibers – Opens Na + -permeable channels Na + influx depolarized membrane reaches threshold action potential
Background image of page 1

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

View Full Document Right Arrow Icon
2 CBNS 106 5 Properties of the Action Potential • The Generation of Multiple Action Potentials – Artificially - inject current into a neuron using a microelectrode CBNS 106 6 Properties of the Action Potential • The Generation of Multiple Action Potentials (Cont’d) – Firing frequency reflects the magnitude of the depolarizing current CBNS 106 7 The Action Potential, In Theory • Depolarization (influx of Na + ) and repolarization (efflux of K + ) • Membrane Currents and Conductances – Current • The net movement of K + across membrane – Potassium channel number
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 7

106L04_5_slides - Introduction Introduction to Neuroscience...

This preview shows document pages 1 - 3. Sign up to view the full document.

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