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[DOC File]Microsoft Word - Title page.doc - My Test Banks
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b. myelinated cells have more leakage through the membrane. c. myelinated axons are larger in diameter. d. myelinated cells have more ion channels per unit area than do non-myelinated cells. e. myelinated fibers have a lower threshold of activation. Difficulty: 2. Question ID: 2.1-80 . Page Ref: 50 . Topic: Conduction of the Action Potential
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With multiple sclerosis, the myelin sheath of nerve fibers is damaged. Among the most common symptoms is a loss sensitivity of the limbs, difficulty in walking, visual impairment, distraction. A. Explain the causes of these symptoms. B. Describe the composition of myelin. Describe the formulas for the most important substances that compose myelin.
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[DOC File]Neurological assessment of head injuries using the Glasgow ...
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Myelinated cells conduct impulses more rapidly than others because they jump between junctional stations called nodes of ranvier. Peripheral nerves and the 12 cranial nerves have this insulating myelin sheath along the fibre, created by Schwann cells.
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[DOC File]Sjogren's Syndrome: A Guide for the Patient
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Aug 16, 2002 · In these patients, the cause of dryness and decreased memory is the loss of myelinated nerve fibers ina particular region of the brain called the subcortical white matter projections. The problems of diagnosis thus become even more difficult when a patient with fatigue and dryness has positive blood tests or a report of a lip biopsy.
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[DOC File]Chapter 1
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a) simple - single layer of cells. b) stratified - > 1 layer of cells - only 1 layer touched basement membrane. c) pseudostratified - contains 1 cell layer but looks multi-layered. Cell Shapes . a) squamous - cells flat and thin. b) cuboidal - cube-like. c) columnar - cells are tall and thin. Epithelium
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[DOC File]Mr. Bisson
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Relate the structure of a myelinated nerve fibre to the speed of impulse conduction [Turn to Figure 16.3 Page 280 before continuing] Some axons are wrapped in a myelin sheath formed from the plasma membranes of specialized glial cells known as Schwann cells. Schwann cells serve as supportive, nutritive, and service facilities for neurons.
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[DOC File]Biology 112 lecture Objectives
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Define a gene and genetic code. Explain the functions of mRNA and tRNA. Be able to describe the role of codons and anticodons. ... Describe the structure of a skeletal muscle fiber including the types of organelles found in the fibers. ... Explain how impulse conduction differs in myelinated and unmyelinated nerve …
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[DOCX File]INTRODUCTION - Human Physiology
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-composed of and epithelial layer (epidermis) and underlying CT supporting layer (dermis) ... ganglia, nuclei, nerve vs. nerve fiber, tracts, endo-, peri-, and epineurium. Neuron (cellular unit of nervous system) A. Structures of the Typical Neuron ... white matter -areas of the CNS with few cell bodies but many myelinated axons.
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[DOC File]7 - Masaryk University
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The axon, sometimes also called a nerve fiber, is a long process that extends from the cell body and carries output to its target cells. Axons range in length from a few microns over a meter. The region where the axon connects to the cell body is known as the initial segment.
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[DOC File]Кафедра нормальной физиологии СПбГПМУ
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3. The thickness of nerve cell membrane is about: A. 5 nanometer B. 7 nanometer . C. 5 ( D. 7(4. The sodium concentration within a nerve fiber is: A. 50 mEq B. 30 mEq. C. 14 mEq D. 4 mEq (p. 54) 5. The K+ concentration within a nerve fiber is: A. 160 mEq B. 140 mEq. С 100 mEq D. 60 mEq (p.
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Myelinated nerve fiber layer code