Laboratorio de tejidos

Practica Nº 3
TEJIDOS

1. Marco Teórico

Histología:Estudio de la estructura y composición química de los tejidos de los animales y las plantas, y la relación con su función.

Tejido animal: Es la agrupación de células eucariotas animales con unaestructura determinada que realiza una misma función especializada vital para el organismo

Clases de tejidos animales:

* TEJIDO MUSCULAR: Células musculares (fibras musculares), capaces de generarmovimientos al contraerse bajo estímulos adecuados y luego relajarse.
Tipos de tejido muscular:
* Musculo esquelético (estriado o voluntario) está formado por manojos de células cilíndricas , muylargas , multinucleadas y estriadas transversalmente, llamadas también fibras musculares esqueléticas .Los núcleos de las fibras se ubican vecinos a la membrana plasmática (sarcolema), que aparecedelimitada por una lámina basal (lámina externa). Se distinguen 3 tipos de fibras musculares esqueléticas:
* Roja
* Blancas
* intermedias

* Musculo Cardiaco: (estriado involuntario) estáformado por células musculares ramificadas, que poseen 1 o 2 núcleos y que se unen entre sí a través de un tipo de unión propia del músculo cardíaco llamada disco intercalar

* Musculo liso:(involuntario) está formado por fibras musculares lisas que corresponden a células uninucleadas, delgadas y aguzadas en los extremos. Este tipo de músculo forma la porción contráctil de la pared de diversosórganos tales como tubo digestivo y vasos sanguíneos, que requieren de una contracción lenta y sostenida. Las células se organizan en grupos, formando haces, rodeados de tejido conjuntivo fibroso quecontiene vasos sanguíneos.

* TEJIDO NERVIOSO

Está formado por 2 tipos de células:
* Neuronas: existen de varias formas y tamaños. Se encargan de recibir y transmitir los impulsos nerviosos….

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