UNIT 2 THE TISSUE LEVEL. EPITHELIAL TISSUE copie.pdf

TYPES of TISSUES in the HUMAN BODY GLAND CONNECTIVE © Copyright Universidad Europea. Todos los derechos reservados MUSCULAR NERVOUS TYPES of TISSUES Embryological origin Endoderm: epithelial. Mesoderm: epithelial, connective and muscular. Ectoderm: epithelial and nervous. © Copyright Universi...

TYPES of TISSUES in the HUMAN BODY GLAND CONNECTIVE © Copyright Universidad Europea. Todos los derechos reservados MUSCULAR NERVOUS TYPES of TISSUES Embryological origin Endoderm: epithelial. Mesoderm: epithelial, connective and muscular. Ectoderm: epithelial and nervous. © Copyright Universidad Europea. Todos los derechos reservados ECTO= EXTERNAL : OUTSIDE ENDO = INSIDE TYPES of TISSUES Epithelial cells: To cover something inside or outside / Epithelial tissu= one or + layer of cells Epithelial tissue: covers body surfaces, lines hollow organs, body cavities, and ducts, and forms glands. It allows interaction with external and internal environments. Connective tissue: protects and supports the body and its organs, binds organs together, stores energy reserves as fat, and provides immunity. Muscle tissue: responsible for movement and generation of force and heat. Nervous tissue: initiates and transmits action potentials (nerve impulses) that help coordinate body activities. © Copyright Universidad Europea. Todos los derechos reservados GENERAL CHARACTERISTICS: epithelial tissue Letters Syllabes Words Sentences Apical cell ✔ Many cells with tight cellular cohesion (small intercellular spaces) arranged in either single or multiple layers. ✔ Avascular: DIFFUSION. Simple epithelium = WITH ONE LAYER ✔ Innervation: neuroepithelium. ✔ Polarization. ✔ Cell division, ability to constantly renew itself. ✔ Moist surfaces due to the presence of mucus and other secretions; except the epidermis. © Copyright Universidad Europea. Todos los derechos reservados Stratified epithelium SKIN WHITH PLUSIEUR LAYER EMBRYOLOGICAL ORIGIN ECTODERM ✔ The sensory epithelia of the eye, ear, and nose. ECTODERM ECTODER M CONTACT AVC ENVIRONEMENT ✔ Lining of anterior tongue, hard palate and sides of the mouth. ✔ The epidermis and its appendages (the nails and hair). © Copyright Universidad Europea. Todos los derechos reservados EMBRYOLOGICAL ORIGIN MESODERM ABLE TO PRODUICE MAJORITY TISSUE Tubular renal epithelium MESODER M Endocardiu m Ureter © Copyright Universidad Europea. Todos los derechos reservados EMBRYOLOGICAL ORIGIN ENDODERM ✔ Epithelial lining of the respiratory and gastrointestinal tracts. ENDODER M ✔ Lining of posterior tongue, soft palate and floor of the mouth. ✔ Biliary tree, liver. © Copyright Universidad Europea. Todos los derechos reservados ✔ Female and male urethra.