Nervous Impulse Action Potential.

Slides:

Advertisements

Similar presentations

Passage of an action potential

Advertisements

The Electrical Nature of Nerves

The Action Potential Objective: To understand how neurones conduct impulses from one part of the body to another. What is this part of the nervous system.

Propagation of the Action Potential The Central Dogma Of Excitable Tissues.

The Action Potential.

HOW MESSAGES ARE SENT.  It is a message travelling down a neuron  The message comes from:  Another neuron or  A sensory receptor  A nerve impulse.

Transmission of Nerve Impulses WALT Neurones transmit impulses as a series of electrical signals A neurone has a resting potential of – 70 mV Depolarisation.

Nerve Impulses Sec 17.1 Pg Memory Makers from Last Class…  Fingerlike Extensions  Outskirts and Organs Please PNS  Conductor Tubes  Go between.

Nervous System: Part II How A Neuron Works. Animals have nervous systems that detect external and internal signals, transmit and integrate information,

Nerve Impulse. A nerve impulse is an impulse from another nerve or a stimulus from a nerve receptor. A nerve impulse causes:  The permeability of the.

Nerve Impulse. A nerve impulse is an impulse from another nerve or a stimulus from a nerve receptor. A nerve impulse causes:  The permeability of the.

P. Ch 48 – Nervous System pt 1.

Quick Review What’s another name for neurons? Can you name the parts of a neuron?

Neurons and Nervous System

Nerve Impulse Every time you move a muscle & every time you think a thought, your nerve cells are hard at work. They are processing information: receiving.

Structures and Processes of the Nervous System – Part 2

Nerve Impulses.

The Action Potential & Impulse/Signal Propagation

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

NERVE IMPULSE TRANSMISSION  nerve cells are like no other cell in the body because they possess an electrical charge  the axon of a neuron has a cell.

Quick Membrane Review 1. 2 Interfere with the neurons ability to transfer electrical impulses Over loads nervous system volts Taser Tasers.

Ch. 12. Objectives Describe the factors that maintain a resting membrane potential. List the sequence of events that generates an action potential.

Nerve Impulses. Neuron Physiology Action Potentials- nerve impulses which are sent by a change in electrical charge in the cell membrane. Depends on ions.

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

Neurones & the Action Potential Objective: To understand how neurones conduct impulses from one part of the body to another. Write down anything you can.

Action & Resting Potentials.  Create the electrical impulses needed for communication in the nervous system  They occur in the axons of all neurones.

Chapter Outline 12.1 Basic Structure and Functions of the Nervous System A. Overall Function of the N.S. & Basic Processes Used B. Classification of.

November 7, 2016 Journal: What is the difference between dendrites and the axon terminal?

Human Anatomy / Physiology

Nervous System Notes Part 4

Action Potential Every time you move a muscle & every time you think a thought, your nerve cells are hard at work. They are processing information: receiving.

Ch. 15 Coordination Part 3.

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

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

LECTURE 5: Nerve Impulses

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

Action Potential.

Unit 2 Notes: Nerve Impulses

Nerve cell membrane Electrochemical message is created by the movement of ions across the nerve cell membrane The resting nerve membrane has a electrical.

Electrochemical Impulse

ACTION POTENTIALS.

Nerve Impulse Conduction

Neurolemma – outer covering of axons

Nerve Impulses.

Warm Up What is actually occurring inside the cell when a neuron has an “impulse” traveling through it?

Nerve Impulses.

Nervous System Impulse Transmission Saltatory Impulse Transmission

The Nerve Impluse.

2 Functional Properties of Neurons

Nervous System “The Neuron”

Cell Communication: Neuron.

Biology Powerpoint #3 Unit 8 – Chapter 35

Structures & Processes of the Nervous System

Today you will: Describe a resting membrane

AP Biology Nervous Systems Part 2.

Nerve Impulses.

The Nervous System AP Biology Unit 6.

Created By: Heidi Hisrich Modified by: K. Hoffman 2018

Notes Ch. 10c Nervous System 1

Biology 12 Neuron Function.

Neural Pathways and Transmission

AP Biology Nervous Systems Part 2.

Structure and Physiology of Neurons

Nerve Impulse (pp ).

Saltatory conduction in nerve impulses

Unit 2 Notes: Nerve Impulses

Presentation transcript:

Nervous Impulse Action Potential

The nature of Nerve Impulse Nerve impulses are caused by the movement of electrically charged ions. **sodium, potassium** These messages are caused by a potential or a difference between the inside and outside of the membrane of the neuron

Resting potential When neuron is at rest More Na+ ions outside More K+ ions inside Uses ATP for active transport to maintain concentration difference Organic negative protein - Gives overall negative charge inside neuron To prevent diffusion

Action Potential – Up Swing aka Depolarization Nerves stimulated by electric shock   pH Membrane becomes permeable to Na+ ions Na+ gates open and Na+ diffuses in

Action Potential - Downswing aka Repolarization Restores negative potential K+ gates open (membrane becomes permeable) - K+ diffuses out Na+ Gates close

Recovery Phase Aka refractory period Na+ and K+ gates unable to open  ensures action potential doesn’t move backwards As soon as action potential has moved to next portion of neuron, previous portion undergoes refractory period. This process requires 1/1000 sec. (Draw Picture from board)

All or Nothing Law The “All or Nothing” Law states that if the threshold is reached an impulse is carried, but if the threshold is not reached then there will be no impulse. It doesn’t matter how strong the stimulus. The same impulse is sent regardless of strength. The sensitivity to mild or severe pain depends on the number of neurons stimulated as well as the frequency of their stimulation.

Action Potential Graph Depolarization Repolarization Refractory Hyperpolarization

Speed of Conduction Non myelinated neuron Action potential occurs at one small section of a neuron at a time Non myelinated neuron Usually occurs in invertebrates/small animals Action potential moves slowly (0.5m/sec)

Myelinated Axon Action potential moves up to 200m/sec In myelinated neurons action potential concentrated at nodes of Ranvier = saltatory conduction. Action potential jumps from node to node Causes “flip-flop” flow of charge Animation

Action potential Review Animation