The action potential is:

Slides:

Advertisements

Similar presentations

The passage and speed of an action potential

Advertisements

Neurons Neurons and neuroglia (multiple sclerosis and neuroglia) Where are neurons in the body? Types of neurons and their functions How do neurons work?

Figure 48.1 Overview of a vertebrate nervous system.

 Nerve fibers are classified according to:  Diameter  Degree of myelination  Speed of conduction Nerve Fiber Classification.

DR. ZAHOOR ALI SHAIKH LECTURE --9

Nervous System Neurophysiology.

Electrical Excitability of Squid Giant Axons Amir Golnabi ENGS166 Spring 2008.

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

The Neuron  The basic functional unit of the nervous system.  Function: Send impulses to and from the CNS and PNS and the effectors (muscles/glands)

Neuron organization and structure reflect function in information transfer The squid possesses extremely large nerve cells and is a good model for studying.

Action Potential Propagation. Action potentials are a means of sending a rapid, ultimately non-decremental signal from one part of a cell to another The.

P. Ch 48 – Nervous System pt 1.

PHYSIOLOGY 1 LECTURE 11 PROPAGATION of ACTION POTENTIALS.

Box 3A The Voltage Clamp Technique

Box A The Remarkable Giant Nerve Cells of a Squid

NEURON ANATOMY. NEURON Dendrites: (dend = tree) cell processes that carry electric impulses from an incoming nerve to a cell body. Hundreds per neuron.

Neurons Neurons and neuroglia (multiple sclerosis and neuroglia) Where are neurons in the body? Types of neurons and their functions How do neurons work?

The microscopic study of tissue. It is important to know the structure and function of tissues In order to understand how individual cells are organized.

AP Biology Nervous Systems Part 3. Synapse and Neurotransmitter.

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

6.5 Neurons and Synapses U1: Neurons transmit electrical signals.

PHYSIOLOGY 1 LECTURE 13 PROPAGATION of ACTION POTENTIALS.

Objective: to describe the general characteristics of and functions of nervous tissue.

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

Neurons, Synapses, and Signaling

Chapter 48: Nervous System

35-2 The Nervous System Pg. 897.

Axonal conductance supported by glial cells

Neurons are highly specialized cells.

Ionic Generation of Electrical Signals

Neurons, Synapses and Signaling

THE NERVE IMPULSE © 2016 Paul Billiet ODWS.

Functional Overview of the Nervous System

Ionic Generation of Electrical Signals

Electrochemical Impulse Aka: An Action Potential

Nervous tissue.

Nervous tissue. Nervous tissue Types of neurons.

The Human Nervous System 35-1

Nerve Impulses.

The master controlling and communicating system of the body

Neurons, Synapses, and Signaling

The Control Systems of the Body

Neurons, Synapses, and Signaling

Action Potential Lesson 11

Neurons, Synapses, and Signaling

The action potential is:

At resting potential Most voltage-gated Na+ and K+ channels are closed, but some K+ channels (not voltage-gated) are open.

Nervous System “The Neuron”

Electrical Current and the Body

AP Biology Nervous Systems Part 3.

Neurons, Synapses, and signaling Chapter 37

The cone snail is a deadly predator. Why?

Histology The microscopic study of tissue.

Neurons Neurons and neuroglia Where are neurons in the body?

AP Biology Nervous Systems Part 1.

Neurons, Synapses, and Signaling

AP Biology Nervous Systems Part 1.

Nerve cells and their support system

AP Biology Nervous Systems Part 3.

Neurons and Nervous Systems

Nervous System.

Neural Communication: Action Potential

AP Biology Nervous Systems Part 3.

AP Biology Nervous Systems Part 1.

بسم الله الرحمن الرحيم NEURON.

Saltatory conduction in nerve impulses

Presentation transcript:

The action potential is: “all-or-none” for a given neuron an action potential will always have the same magnitude conducted without decrement subthreshold stimuli decay with distance action potentials are self-generating - they’re the same magnitude at one end of the axon as at the other

Conduction velocity In invertebrate neurons - C.V. a D0.5 Diameter (µm) C.V. (m • s-1) Crab leg axon 30 4.4 Squid giant axon 260 18 500 33 Cat 6 30 10 50 15 80 20 110

Saltatory Conduction

Nucleus Schwann cell Axon Nucleus Myelin sheath