PPT-Cells and Potentials

Voltaic Cells In spontaneous oxidationreduction redox reactions electrons are transferred and energy is released 2009 PrenticeHall Inc Voltaic Cells We can use that energy to do work if we make the electrons flow through an external device. This table is adapted from table 214 of the IPCC Fourth Assessment Report 2007 The 4 th assessment report values are the most recent 2007 but the second assessment report values 1995 are al so listed For more information please see the IPCC website 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. 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% . 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 . 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). Electron Transfer Reaction. Section 20.1. Oxidation-Reduction Reactions. Oxidation: loss of electrons, increase in oxidation state. Reduction: gain of electrons, decrease in oxidation state. . . . . E. . = . -. f. . . . Scalar Potential . f . and Electrostatic Field . E. . .  . x . E. = -. ∂. B. /. ∂. t . Faraday’s Law.  x -. . f . = 0 ≠ . -. ∂. B. /. ∂. t . LL2 Section 63. Lienard-Wiechert. are the retarded potentials of a point charge. Potentials at the field point are determined by the state of motion at the earlier time . t’. , where . t. = “now”.. 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. Steven Kolaczkowski. Time Independent Schrödinger Equation (TISE) and the Infinite Potential Well. Free Particle solution: if . , then our original harmonic wave solutions works and we can say . . You can verify that this will get us . Needle Electromyography. It is the study of electrical potentials developed in the muscle both at rest and on volition. . There are . over 400 skeletal muscles. in the body for assessment by electromyography (EMG)..