By Laurie Kelly McCorry
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Even in precedent days, respiring was once believed to be crucial function of existence itself. The very Universe was once considered as an enormous respiring organism, during which the whole lot used to be on the topic of every thing else via a means of vibration - or breath. these days, our figuring out of the legislation governing the Universe and existence has complicated greatly.
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Transmission of electrical impulses in a myelinated axon occurs by way of saltatory conduction. Composed primarily of lipid, the myelin sheath insulates the axon and prevents generation of membrane potentials. Membrane potentials occur only at gaps in the myelin sheath, referred to as the nodes of Ranvier. Therefore, transmission of the impulse, or generation of action potentials, occurs only at the nodes. directly correlated to the urgency of the information conveyed by a given neuron. Nerve fibers carrying less important information, such as those regulating slow digestive processes, are unmyelinated.
As will be discussed, depolarization makes the neuron more excitable. Hyperpolarization occurs when the membrane potential becomes more negative, moving away from zero. Hyperpolarization tends to make the neuron less excitable. Depolarization and hyperpolarization signals are transient or short-lived. Once the stimulus has been removed, the membrane potential returns to its resting state. 1 Types of changes in membrane potential. The resting membrane potential in a typical neuron is –70 mV. Movement of the membrane potential toward zero (less negative) is referred to as depolarization.
Fm Page 33 Wednesday, February 18, 2004 9:30 AM chapter four: Electrical signals 33 Bibliography 1. Catterall, W. G. , McGraw–Hill, New York, 1996, chap. 15. 2. B. Saunders, Philadelphia, 1998. 3. C. B. Saunders, Philadelphia, 1996. 4. H. , Philadelphia, 1999, chap. 1. 5. , Brooks/Cole, Pacific Grove, CA, 2001. 6. , Prentice-Hall, Upper Saddle River, NJ, 2001. 1 Introduction The function of a neuron is to communicate or relay information to another cell by way of an electrical impulse. A synapse is the site at which the impulse is transmitted from one cell to the next.