Ionic Generation of Electrical Signals

Slides:

Advertisements

Similar presentations

Outline Neuronal excitability Nature of neuronal electrical signals Convey information over distances Convey information to other cells via synapses Signals.

Advertisements

Outline Neuronal excitability Nature of neuronal electrical signals Convey information over distances Convey information to other cells via synapses Signals.

Passage of an action potential

The Electrical Nature of Nerves

Gated Ion Channels A. Voltage-gated Na + channels 5. generation of AP dependent only on Na + repolarization is required before another AP can occur K +

Lecture 4- Action Potential propagation and synaptic transmission ©Dr Bill Phillips 2002, Dept of Physiology Continuous Propagation of action potentials.

Figure 48.1 Overview of a vertebrate nervous system.

The Action Potential.

Chapter 11-Part II Biology 2121

Nervous systems. Keywords (reading p ) Nervous system functions Structure of a neuron Sensory, motor, inter- neurons Membrane potential Sodium.

Nervous System Neurophysiology.

Synaptic Signaling & The Action Potential

Announcements Tutorial next Thursday, Oct 9 –Submit questions to me Mid-term schedule Go vote!

Physiology of The Nerve Week 4 Dr. Walid Daoud A. Professor.

NERVOUS TISSUE Chapter 44. What Cells Are Unique to the Nervous System? Nervous systems have two categories of cells: Neurons generate and propagate electrical.

Neurons and Nervous System

Nervous System.

Psychology 3600 Action Potential Saltatory Conduction Ion Channels Membrane Currents.

Chapter 7 Transport of Ions and Small Molecules Across Cell Membranes By Christi Haines.

Unit 1 Opener neuro4e-unit-01-opener.jpg.

Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Human Anatomy & Physiology, Sixth Edition Elaine N. Marieb PowerPoint ® Lecture.

Electricity Definitions Voltage (V) – measure of potential energy generated by separated charge Voltage (V) – measure of potential energy generated by.

Bioelectrical phenomena in nervous cells. Measurement of the membrane potential of the nerve fiber using a microelectrode membrane potential membrane.

Neurons Structure and Function G.Burgess. Neuron Specialized cells that send electric signals as impulses through the body.

Box 3A The Voltage Clamp Technique

Box A The Remarkable Giant Nerve Cells of a Squid

Copyright © 2004 Pearson Education, Inc., publishing as Benjamin Cummings Human Anatomy & Physiology, Sixth Edition Elaine N. Marieb PowerPoint ® Lecture.

The Action Potential & Impulse/Signal Propagation

Objectives Basics of electrophysiology 1. Know the meaning of Ohm’s Law 2. Know the meaning of ionic current 3. Know the basic electrophysiology terms.

Structure of a nerve Nerves and Nerve impulses “Nerve impulse: a self-propagating wave of electrical disturbance which travels along the surface of a.

Announcements Midterm –Saturday, October 23, 4:30pm Office Hours cancelled today.

PHYSIOLOGY OF THE NERVOUS SYSTEM Neurons are IRRITABLE Ability to respond to a stimulus! (What’s a stimulus?)

The Action Potential. Four Signals Within the Neuron  Input signal – occurs at sensor or at points where dendrites are touched by other neurons.  Integration.

AP Biology Nervous Systems Part 3. Synapse and Neurotransmitter.

Action Potentials. Membrane Potential Electrical charge inside a neuron is different than interstitial space Resting membrane potential (RMP) is -70mV.

6.5 Neurons and synapses Essential idea: Neurons transmit the message, synapses modulate the message. Nature of science: Cooperation and collaboration.

Action Potential & Propagation

Electrochemical Impulses

Animal Cell Chromatin.

Do what you can, with what you have, where you are.

Synaptic Signaling & The Action Potential

What is the part of the neuron that receives signals? Sends them?

Action Potential Propagation

NOTES - UNIT 5 part 2: Action Potential: Conducting an Impulse

Unit 2 Notes: Nerve Impulses

Functional Overview of the Nervous System

Neurophysiology.

Ionic Generation of Electrical Signals

Nerve Impulses.

Events of action potential

Electrochemical Impulse Aka: An Action Potential

The Nerve Impulse.

Animal Cell Chromatin.

Nerve Impulses.

Neuron Physiology.

Electrical Current and the Body

Cell Communication: Neuron.

AP Biology Nervous Systems Part 3.

12-5 Action Potential Action Potentials

Neural Condition: Synaptic Transmission

AP Biology Nervous Systems Part 2.

Animals have nervous systems that detect external and internal signals, transmit and integrate information, and produce responses. Neurons.

Animals have nervous systems that detect external and internal signals, transmit and integrate information, and produce responses. Neurons.

Action potential and synaptic transmission

Notes Ch. 10c Nervous System 1

AP Biology Nervous Systems Part 3.

AP Biology Nervous Systems Part 2.

AP Biology Nervous Systems Part 3.

Nerve Impulse (pp ).

Saltatory conduction in nerve impulses

Presentation transcript:

Ionic Generation of Electrical Signals AMPA Receptor

Types of Electrical Signals

The Remarkable Giant Nerve Cells of a Squid

Recording Passive and Active Electrical Signals in a Nerve Cell

Ionic Movements Across Neuronal Membranes

Electrochemical Equilibrium

Extracellular and Intracellular Ion Concentrations

Resting and Action Potentials Entail Permeabilities to Different Ions

Depolarization Increases Na+ and K+ Conductances of the Squid Giant Axon

Mathematical Reconstruction of the Action Potential

Feedback Cycles Responsible for Membrane Potential Changes

Membrane Conductance Changes

Passive Current Flow in an Axon

Propagation of an Action Potential Affects Voltage Changes

Voltage-Gated Na+ and K+ Channels

Mathematical Reconstruction of the Action Potential

Action Potential Conduction

Saltatory Action Potential Conduction Along a Myelinated Axon

Speed of Action Potential Conduction in Unmyelinated Versus Myelinated Axons

Different Forms of Action Potentials A Squid B Frog motor neuron - axon C Frog motor neuron – cell body D Inferior olive cell body E Purkinje neuron cell body