surrounds the core of a nerve fiber or axon and that facilitates the transmission of nerve impulses‚ formed from the cell membrane of the Schwann cell in the peripheral nervous system and from oligodendroglia cells. Myelin sheaths three main functions include are protection of the nerve fiber‚ insulation of the nerve fiber and increasing the rate of conduction of nerve impulses. Dendrites Dendrites are a short branched extension of a nerve cell‚ along which impulses received from other cells
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Immaculate Heart of Mary College SY 2012-2013 BIOLOGY EXCRETORY SYSTEM MODULE Urea is the main nitrogenous waste excreted by most mammals and is formed in the liver. It circulates the body and most of the urea produced by the body is transported to the kidneys. ORGANS OF EXCRETION ORGAN | WASTE EXCRETED | Skin | Sweat | Lungs | Carbon dioxide | Liver | Water‚ salts | Large intestine | Feces | Kidneys | Urine | THE KIDNEYS The kidneys are the main organs of excretion
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Figure 15.24b Structure of the ear. Oval window (deep to stapes) Entrance to mastoid antrum in the epitympanic recess Malleus (hammer) Incus Auditory (anvil) ossicles Stapes (stirrup) Tympanic membrane Semicircular canals Vestibule Vestibular nerve Cochlear nerve Cochlea Round window Middle and internal ear © 2013 Pearson Education‚ Inc. Pharyngotympanic (auditory) tube MIDDLE EAR STRUCTURES • Air-filled cavity in temporal bone • Auditory ossicles (outer to inner): – – – – – Malleus Incus Stapes
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Biopsychology: A specialty that studies the interaction of biology‚ behavior‚ and mental processes. Evolution: The gradual process of biological change that occurs in a species as it adapts to its environment new generations change as they adapt to changing environments Evolution has fundamentally shaped psychological processes because it favors genetic variations that produce adaptive behavior Charles Darwin:Wondered if animals were related and if all creations‚ even humans‚ could
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from the cell body to other neurons‚ muscles and glands * Can be very long projecting several feet into the body * Myelin sheath – a layer of fatty tissue segmentally encasing the fibres of many neurons * Allows for fast impulse transmission among neurons * If myelin sheath degenerates‚ communication to muscles
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Anatomy review for the nervous system - Week 12 Study Guide 1. Distinguish the difference between neuron‚ neuroglial cells‚ Schwann cells‚ neurofibrils‚ and astrocytes. Neuron: masses of nerve cells in nervous tissue Neuroglial Cells: provide neurons physiological requirements (fill spaces‚ give support to neurons) Schwann Cells: larger axons of peripheral neurons enclosed in sheaths Neurofibrils: thin‚ long fibrils that run through body of neuron and extends to axon and dendrites; gives neuron
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movements such as inhibiting tremors – controls position 13-26_5) A) shingles (Herpes Zoster) 1) acute inflammation/infection of the peripheral nervous system due to the chicken pox virus a) variciella virus 2) characterized by pain and a rash with watery blisters and a red area that itches a) can result from trauma or reaction to certain drug injections b) Cab accompany other diseases such as TB and pneumonia c) Follows a nerve root or can effect the
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(CNS) is the nerves in our brain and spinal chord. The peripheral nervous system (PNS) is a network of nerve cells in the rest of our body. -Our nervous system detects stimuli and allows us to react to them. -Stimulus: a change‚ action or occurrence in the environment that can cause an organism to respond. Eg. Light‚ noise‚ pressure… How do we detect stimuli? -We have sensory organs that detect particular stimuli eg. Skin What happens after we have detected a stimulus? 1. An impulse (electrical
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voluntary time; the reason could be that when you had to hear the sound for the voluntary activation you had to process the sound than process kicking. This would take longer than automatically kicking with the involuntary activation. In the body an impulse nerve signal had to be sent to the object reacting in this case kicking your leg. 2. How does your reaction time to the voluntary action of your quadriceps compare with your reaction time to the simple reaction task in Project 2.2.3? The task in this
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Published in 2011 by Britannica Educational Publishing (a trademark of Encyclopædia Britannica‚ Inc.) in association with Rosen Educational Services‚ LLC 29 East 21st Street‚ New York‚ NY 10010. Copyright © 2011 Encyclopædia Britannica‚ Inc. Britannica‚ Encyclopædia Britannica‚ and the Thistle logo are registered trademarks of Encyclopædia Britannica‚ Inc. All rights reserved. Rosen Educational Services materials copyright © 2011 Rosen Educational Services‚ LLC. All rights reserved. Distributed exclusively
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