Chapter 4 Tissues

Chapter 4 Tissues - Chapter 4 Tissues Angela Peterson-Ford,...

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Chapter 4 Tissues Angela Peterson-Ford, PhD August 31, 2010 apetersonford@collin.edu
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Tissues Groups of cells similar in structure and function The four types of tissues Epithelial Connective Muscle Nerve
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Epithelial Tissue Cellularity – composed almost entirely of cells Special contacts – form continuous sheets held together by tight junctions and desmosomes Polarity – apical and basal surfaces Supported by connective tissue – reticular and basal laminae Avascular but innervated – contains no blood vessels but supplied by nerve fibers Regenerative – rapidly replaces lost cells by cell division
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Classification of Epithelia Simple or stratified Figure 4.1a
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Classification of Epithelia Squamous, cuboidal, or columnar Figure 4.1b
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Epithelia: Simple Squamous Single layer of flattened cells with disc-shaped nuclei and sparse cytoplasm Functions Diffusion and filtration Provide a slick, friction-reducing lining in lymphatic and cardiovascular systems Present in the kidney glomeruli, lining of heart, blood vessels, lymphatic vessels, and serosae
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Epithelia: Simple Squamous Figure 4.2a
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Epithelia: Simple Cuboidal Single layer of cubelike cells with large, spherical central nuclei Function in secretion and absorption Present in kidney tubules, ducts and secretory portions of small glands, and ovary surface
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Epithelia: Simple Cuboidal Single layer of cubelike cells with large, spherical central nuclei Function in secretion and absorption Present in kidney tubules, ducts and secretory portions of small glands, and ovary surface Figure 4.2b
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Epithelia: Simple Columnar Single layer of tall cells with oval nuclei; many contain cilia Goblet cells are often found in this layer Function in absorption and secretion Nonciliated type line digestive tract and gallbladder Ciliated type line small bronchi, uterine tubes, and some regions of the uterus Cilia help move substances through internal passageways
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Epithelia: Simple Columnar Figure 4.2c
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Epithelia: Pseudostratified Columnar Single layer of cells with different heights; some do not reach the free surface Nuclei are seen at different layers Function in secretion and propulsion of mucus Present in the male sperm-carrying ducts (nonciliated) and trachea (ciliated)
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Epithelia: Pseudostratified Columnar Single layer of cells with different heights; some do not reach the free surface Nuclei are seen at different layers Function in secretion and propulsion of mucus Present in the male sperm-carrying ducts (nonciliated) and trachea (ciliated) Figure 4.2d
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Thick membrane composed of several layers of cells Function in protection of underlying areas subjected to abrasion Forms the external part of the skin’s epidermis (keratinized cells), and linings of the esophagus, mouth, and vagina (nonkeratinized cells)
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Chapter 4 Tissues - Chapter 4 Tissues Angela Peterson-Ford,...

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