PPT-Transmission of Action Potentials

Miss Tagore Year 13 Biology Lesson Starter In the resting phase of an action potential what type of protein in the cell membrane is active The sodium potassium pump Sodium channels are closed as are the majority of potassium channels. Action potentials serve a very different function in neu ronal cell bodies where they encode information in their frequency and pattern than in axons where they serve primarily to rapidly propagate signals over distance The membrane of the squid axo Learning Objectives. To understand what factors affect the speed of conductance of an action potential.. To understand what the ‘refractory period’ is.. To understand what the role of the refractory period is in separating one impulse from the next.. Learning Objectives. To understand how an action potential is propagated along an axon.. To understand the difference between the propagation of action potentials in . myelinated . and . unmyelinated. Stimulus and Response. Membrane Model. The dc generator is very low capacity.. What does this means (structurally)?. Membrane Components. Action Potentials. Active Responses. APs at Above Threshold Stimuli. ANSWER: via the endocrine and nervous systems. Why is it important for us to understand how cellular . c. ommunication works?. The Nervous . S. ystem: Parts & Pieces. Two cell types in the NS: 10% Neurons & 90% . presynaptic ending – . portion of the . axon . conveying information to the next neuron. . Some terms…….. presynaptic ending – . the portion of the axon that is conveying information to the next neuron. In the CNS:. Neuroglia. In the PNS:. Neuroglia. Myelination. is the process of forming a myelin sheath. which . insulates and increases nerve impulse speed. .. It is formed by. Oligodendrocytes . in the CNS and by . Review:. What decision is made by a neuron?. At what location the decision is made?. How the decision is made?. Simple decision rule: . if . E. m. > threshold (-40mV) .  fire an action potential. potential, conductance. There are two types of electrical . potential:. - . Action potential (propagated . inpulse. ). - . Electrotonic. potential (. non-propagated local potential, resulting from a local change in ionic . And how this relates to the beating of your heart. Outline. The story of an action potential. Digression: Heartbeats and action potentials. Ion Channels. Three stages:. Polarization (and resting state). and Synapses. Brain and Behavior. David Eagleman. Jonathan . Downar. Chapter Outline. The Cells of the Brain. Synaptic Transmission: Chemical Signaling in the Brain. Spikes: Electrical Signaling in the Brain. OBJECTIVES. Define. . the action potential.. Describe. the . changes. . during action potential.. Discuss . conduction. (propagation) of action potential. Describe . recording . of . monophasic. HONORS ANATOMY & PHYSIOLOGY. Key terms. action potential. : A short-term change in the electrical potential that travels along a cell (such as a nerve or muscle fiber); the basis of neural communication. By:. Somesh. Kumar Malhotra. Assistant Professor,. ECE . Deptt.,UIET,CSJM. University. EEG. EEG. EEG. Brain waves classification. For obtaining basic brain patterns of individuals, subjects are instructed to close their eyes and relax.