EpithelialConnectiveTissues

EpithelialConnectiveTissues - Epithelial and Connective...

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Unformatted text preview: Epithelial and Connective Tissues Danil Hammoudi.MD Figure 4.1 4 types of human tissues Epithelium Connective tissue Muscle tissue Skeletal Cardiac Smooth muscles Nerve tissue Tissue derivation Ectoderm Mesoderm Endoderm Epithelium derivation Ectoderm forms epidermis Mesoderm form mesothelium Endoderm forms the lining of the GI CONNECTIVE TISSUE AND MUSCLES DERIVATION MESODERM NERVES DERIVATION E C T O D E R M EPITHELIUM epithelium is a tissue composed of a layer of cells. Epithelium lines both the outside (skin) and the inside cavities and lumen of bodies . The outermost layer of our skin is composed of dead stratified squamous epithelial cells, as are the mucous membranes lining the inside of mouths and body cavities. Other epithelial cells line the insides of the lungs, the gastrointestinal tract, the reproductive and urinary tracts, and make up the exocrine and endocrine glands. Functions of epithelial cells include : secretion, absorption, protection, EXCEPT JOINTS CAVITIES, ANTERIOR SURFACE OF THE IRIS [NECKED CONNECTIVE TISSUE] transcellular transport, sensation detection, and selective permeability. Endothelium (the inner lining of blood vessels) is not related to epithelium except by name. unctions of Epithelial Tissue Protection Epithelial cells from the skin protect underlying tissue from mechanical injury, harmful chemicals, invading bacteria and from excessive loss of water . Sensation Sensory stimuli penetrate speed epithelial cells . Speed epithelial tissue containing sensory nerve endings is found in the skin, eyes, ears, nose and on the tongue. Secretion In glands, epithelial tissue is speed to secrete specific chemical substances such as enzymes, hormones and lubricating fluids. Absorption Certain epithelial cells lining the small intestine absorb nutrients from the digestion of food . Excretion Epithelial tissues in the kidney excrete waste products from the body and reabsorb needed materials from the urine . Sweat is also excreted from the body by epithelial cells in the sweat glands. Diffusion Simple epithelium promotes the diffusion of gases, liquids and nutrients . Because they form such a thin lining, they are ideal for the diffusion of gases (eg. walls of capillaries and lungs). Cleaning Ciliated epithelium assists in removing dust particles and foreign bodies which have entered the air passages. Reduces Friction The smooth, tightly-interlocking, epithelial cells that line the entire circulatory system reduce friction between the blood and the walls of the blood vessels . ENDOTHELIUM = CARDIOVASCULAR SYSTEM MESOTHELIUM = PERITONEAL CAVITY , THORACIC CAVITY, PERICARDIAL CAVITY pithelial cells: Sit on a basal lamina (formerly called a basement membrane)....
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EpithelialConnectiveTissues - Epithelial and Connective...

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