Effects of Excitatory and Inhibitory Potentials on Action Potentials

Slides:

Advertisements

Similar presentations

Advertisements

Neural Signaling: Postsynaptic Potentials Lesson 9.

Mean = 75.1 sd = 12.4 range =

SYNAPSES AND NEURONAL INTEGRATION

Neurotransmitter Release Signal Received (EPSP/IPSP)

Neuro I Or: What makes me do that Voodoo that I Do so Well!

LECTURE 9: INTEGRATION OF SYNAPTIC INPUTS (Ionotropic Receptors) REQUIRED READING: Kandel text, Chapter 12 At neuromuscular synapse, single axonal action.

Neurophysiology. The Resting Membrane Potential Intracellular (soma) Extracellular VV -70 mV.

Chemical synapses: post-synaptic mechanisms. Postsynaptic Membranes and ion channels Ligand gated ion channels – a review a. Resting K + channels: responsible.

Effects of Excitatory and Inhibitory Potentials on Action Potentials Amelia Lindgren.

Inhibitory and Excitatory Signals

Neural Condition: Synaptic Transmission

1 Psychology 304: Brain and Behaviour Lecture 11.

Cellular Anatomy Lecture 2

Copyright © 2010 Pearson Education, Inc. The Synapse A junction that mediates information transfer from one neuron: To another neuron, or To an effector.

Physiology of synapses, interneuronal connections

SYNAPTIC & NEUROMUSCULAR TRANSMISSION Ass. Prof. Dr. Emre Hamurtekin EMU Faculty of Pharmacy.

Neuron Synapses I.Anatomy of the Synapse II.Chemical Synapse III.EPSP & IPSP IV.Neurotransmitters.

Action Potential: Resting State Leakage accounts for small movements of Na + and K + Each Na + channel has two voltage-regulated gates.

Neurons & Nervous Systems. nervous systems connect distant parts of organisms; vary in complexity Figure 44.1.

Electrical signals Sodium ions Potassium ions Generate an action potential at the axon hillock Travels down the axon to the terminal – regenerating the.

Action Potential revisited When a stimulus reaches threshold level, Sodium channels open up and Sodium rushes into the axon along the concentration gradient.

Nervous Systems Part 3 RA # 4.3. What is a synapse?  Gaps between neurons or between neurons and effectors.

Nervous System. -Central Nervous System -Peripheral Nervous System Brain Spinal Cord Cranial Nerves Spinal Nerves Peripheral Ganglia Division of the nervous.

Electrochemical Impulses

University of Jordan1 Physiology of Synapses in the CNS- L4 Faisal I. Mohammed, MD, PhD.

Do Now 1/9/15 1.Name 3 glial cells and describe their function and location. 2.Which neural pathway transmits a signal when the internal body temperature.

Synaptic transmission

© 2018 Pearson Education, Inc..

Chemical synapses: post-synaptic mechanisms

Biopsychology 2 AQA A Specification:The structure and function of sensory, relay and motor neurons. The process of synaptic transmission, including reference.

Building the Model Neurons or parts of neurons Ions Gates dendrite

Neuronal Anatomy and Communication

Chapter 48: Nervous System

Chapter 37: Neurons, Synapses and Signaling FIGURE 37.1: CONE SNAIL!

The Nervous System Allows communication between cells & tissues of the body. Acts like a telephone or computer network with a complex central control.

Neurons, Signals, Synapses

13.1 Overview of the nervous system

Action Potential Propagation

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

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

What is the neural basis of behavior?

Neurons Parts of a Neuron Dendrite Axon Myelin sheath

Neurons, Synapses, and Signaling

2 Functional Properties of Neurons

Communication Within the Nervous System

Interneuronal connections

2 primary cell types in nervous system

10.6: Cell Membrane Potential

AP Biology Nervous Systems Part 3.

Neural Condition: Synaptic Transmission

A junction that mediates information transfer from one neuron:

Neuronal Signals.

Synapses, properties & Transmission

Unit 5, Part 2 Notes – The Nervous System

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

Neural Signaling: Postsynaptic Potentials

Notes Ch. 10c Nervous System 1

AP Biology Nervous Systems Part 3.

Functional Anatomy Excitatory Synapses Inhibitory Synapses

Synapes and Synaptic Transmission

AP Biology Nervous Systems Part 3.

Gates + Potentials.

Today you will: Define threshold and use it to explain the all-or-none response Describe a synapse Explain how chemical transmitters aid in transmission.

Synaptic Transmission and Integration

Action Potential.

Learning Objectives After this class, you should be able to:

Resting Membrane Potential

Neural Condition: Synaptic Transmission

Presentation transcript:

Effects of Excitatory and Inhibitory Potentials on Action Potentials

Overview of A Neuron Found in brain, spinal cord and nervous system Electrically excitable Communicate via electrical and chemical synapses Made up of a soma (cell body), dendritic tree and an axon

Axon Properties Where action potential is propagated Contains voltage gated sodium and potassium channels Resting membrane potential: ~ -65 mV

Action Potential Occurs when membrane potential exceeds the threshold potential Occurs when Na+ channels are activated (inflow of Na+) Causes positive slope of action potential K+ channels open slightly later (outflow of K+) Causes downward slope of action potential

Transmission of Action Potential Across Synapse Pre-synaptic cell action potential releases Ca2+ in the axon terminal Axon terminal releases vesicles filled with neurotransmitters Inhibit or help create an action potential Excitatory Neurotransmitters: Acetylcholine glutamate Inhibitory Neurotransmitters: GABA glycine http://thebrain.mcgill.ca/flash/i/i_01/i_01_m/i_01_m_ana/i_01_m_ana.html#2

Post Synaptic Potentials Inhibitory Post Synaptic Potentials (IPSP) Decreases the potential of the membrane Increases permeability of K+ K+ flows out of cell Decreases the chances of an action potential Excitatory Post Synaptic Potentials (EPSP) Creates positive synaptic potential Positive charged ions flow in Allows Na+ into cell Easier for Action Potential to fire

Ways to Achieve Action Potential Temporal Summation One neuron acting on another Potential starts before the previous one ends Amplitudes of potentials summate to create larger potential Spatial Summation Multiple cells provide input Input is received in different areas Input is summated to create a larger potential

Observations Increasing the intensity does not increase the size of the action potential Action potential is “all or none” response Potentials can summate to elicit or inhibit an action potential Must reach a specific threshold potential to create and action potential that will be propagated

Conclusion Many different ways to elicit an action potential or to inhibit one Temporal and Spatial Summation allow for greater complexity in neural networks This allows for greater complexity in organisms neuron can communicate with multiple neurons > greater efficiency.