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Sumario Tejido Muscular

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Resumen sobre el tejido muscular, nos introduce a los 3 tipos de músculos que encontramos en el organismo y nos permite identificarlos en el microscopio. Nos señala la composición, diferencias, funciones, y características de los 3 tipos de musculo

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  • February 2, 2024
  • 12
  • 2023/2024
  • Summary
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TEJIDO EPITELIAL

GENERALIDADES
- Células epitelioides derivan de las células mesenquimales progenitoras
- Tapiza la superficie del cuerpo
- Reviste las cavidades corporales
- Forma glándulas
- Avascular
- Se adhieren entre sí por uniones intercelulares especializadas
- Tienen polaridad funcional y morfológica
- Falta de superficie libre = tejido epitelioide
- Crea una barrera selectiva entre el medio externo y el tejido subyacente
- Barrera selectiva = facilita / inhibe el intercambio de sustancias específicas entre el medio externo

* los patrones epiteliales estan formados por acumulacoines de macrofagos de tejido conjuntivo en respuesta a ciertos tipos
de lesiones e infecciones así como diversos tumores derivados del epitelio



EJEMPLOS DE EPITELIOS EN EL CUERPO

PLANO SIMPLE Endotelio - mesotelio - riñón - pulmón
Función de intercambio y lubricación




ENDOTELIO = recubre vasos sanguíneos y linfáticos

MESOTELIO = tapiza las paredes y el contenido de las cavidades cerradas del cuerpo

CÚBICO SIMPLE Estómago - glándulas gástricas - Intestinos
Función de Secreción y Absorción y Conducción




CILÍNDRICO SIMPLE Intestino delgado - Colon - Estómago - Glándulas gástricas
Función de Absorción y Secreción




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, TRANSICIÓN- UROTELIO Calicles renales - Uréter - vejiga - uretra
Función de barrera y distensibilidad




Transporte mediante movimiento ciliar



LA CÉLULA EPITELIAL




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