Despite the complexity of the human body and the diversity of organs it contains; there are only four tissues called basic or principal tissues - these are epithelium‚ connective tissue‚ muscle and nerve tissue. The following paragraphs describe the main structural features‚ functions and sub-divisions of each type of tissue. EPITHELIUM Epithelium is characterised by closely packed cells and has very little extra-cellular material (ground substance or fibres). Cells are held together by means of
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(air sac) in the lung is composed of which type of epithelium? simple squamous epithelium Yes‚ this single layer of squamous cells is ideal for the diffusion of gases in the lungs. 1) The proximal tubule of the nephron (kidney tubule) in the kidney is composed of which type of epithelium? simple cuboidal epithelium Yes‚ the simple cuboidal cells line the kidney tubules (nephrons) so that secretion and absorption can take place. 2) The epithelium of the esophagus is composed of which type of epithelial
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Ductal hyperplasia Ductal hyperplasia is characterized by proliferation of ductal epithelium‚ resulting in increased cellularity and multi layering of ductal epithelium. The pattern of growth varies greatly from case to case leading to different types of ductal hyperplasia. Features indicative of benign nature of the lesion includes oval nuclei with indistinct cytoplasmic border and eosinophilic rather than pale cytoplasm‚ arrangement of the cells in parallel bundles‚ presence of peripheral elongated
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The Organisation Level of an Organ System. There are 11 organ systems in the body such as the reproductive system‚ digestive system and the cardiac system. The first level organisation is the organelles which collect together to produce a cell. The organelles all have a function in the cell to keep it alive. For example the mitochondria is an organelle in a cell which has the role of respiration in the cell. The mitochondria produces ATP which involves contracting muscles‚ taking part in cell division
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junction c) plasmodesmata d) adhesion junction e) desmosome _____27. Haversian canals and a matrix of crystals of calcium phosphate would be found in a) teeth b) nails c) hooves d) bone e) cartilage _____28. Cuboidal epithelium would be found a) in the walls of the heart. b) in the knees and other joints as well as in the nose and tracheal rings. c) on the surface of the skin. d) lining glands and kidney tubules‚ and covering the ovaries. e) in tendons and the sheath
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RESPIRATORY SYSTEM Respiration (processes) 1. Ventilation and breathing‚ which is the movement of air into and out of the lungs 2. Exchange of oxygen and carbon dioxide between the air in the lungs and the blood 3. Transport of oxygen and carbon dioxide between the blood and tissues 4. Exchange of oxygen and carbon dioxide between the blood and tissues. Function 1. Regulation of blood pH 2. Voice production 3. Olfaction 4. Innate immunity ANATOMY OF THE RESPIRATORY SYSTEM A. Upper respiratory
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the key. Key: a. cutaneous ‚ ‚ ‚ b. mucous c. serous d. synovial 1. membrane type in joints‚ bursae‚ and tendon sheaths 2. epithelium of this membrane is always simple squamous epithelium 3. membrane types not found in the ventral body cavity 4. the only membrane type in which goblet cells are found 5. the dry membrane with keratinizing epithelium 6. “wet” membranes 7. adapted for absorption and secretion 8. has parietal and visceral layers 51 3. Using terms from the key
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Membranes ObservatiOns Draw and describe the structures you observed of the following slides: A. Pseudostratified ciliated columnar epithelium of the trachea B. Stratified squamous epithelium (non-keratinized) of the esophagus C. Simple columnar epithelium (duodenum) of the small intestine QuestiOns A. Compare and contrast the roles of the three mucous membranes
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due to being protected from antibiotics and anti-bacterial drugs. Gram-negative bacteria in biofilms emit vesicles that are abundant in lipopolysaccharides (LPS). The biofilms distribute a steady‚ restorative supply of lipopolysaccharide. When the epithelium pocket appears‚ it has entry to connective tissues and circulation. Substantial interruption and elimination are efficient ways of treating biofilms. For this reason‚ scaling and root planning are crucial in all prosperous forms of periodontal
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Tonsillitis is inflammation of the pharyngeal tonsils. The inflammation usually extends to the adenoid and the lingual tonsils; therefore‚ the term pharyngitis may also be used (1). Tonsillitis most often occurs in children; however‚ the condition rarely occurs in children younger than 2 years. Tonsillitis caused by Streptococcus species typically occurs in children aged 5-15 years‚ while viral tonsillitis is more common in younger children (1). Most cases of bacterial tonsillitis are caused by group
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