Tecido Epitelial
Autor: Natal Skeptics | Publicado: 2011-11-03T10:46:00-07:00

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A estratégia da multicelularidade&nbsp; dos animais tem como vantagem especializar cada tipo de tecido em funções específicas, dando um melhor aproveitamento da célula.
O tecido epitelial tem função de proteção, secreção, absorção e percepção, são classificados como de revestimento e glandulares.
De revestimento: reveste internamente diversos órgãos e vasos sanguíneos, e é a camada mais externa da pele, suas células são fortemente unidas e são ausentes de vasos, sendo nutridas geralmente por tecido conjuntivo. Suas subdivisões são feitas a partir de como as células são organizadas: &nbsp;pavimentosos(células achatadas), cúbicos, prismáticos e de transição(formas variáveis). Simples, estratificado e pseudoestratificado quanto as camadas.&nbsp;
Ex: cúbico(rins), estratificado pavimentoso(epiderme), prismático(intestino).
Câncer de pele(Melanoma) atinge o tecido epitelial, na epiderme, mais precisamente nos melanócitos, células que produzem melanina(pigmentação da pele), causando uma produção descontrolada de pigmento.
Glândulas – Holocrina(holos –total) ex: glândulas sebácias. Merócrinas(meros – parte) ex: salivares e sudoríparas. Apocrinas(após separado) ex: glândula mamária&nbsp; Células de langerhan proteção imunidade, merkel mecano receptores
O tecido epitelial por ser muito junto evita a perda de agua e entrada de moléculas externas.
Pelo é feito de queratina e saí do folículo piloso
A pele demora cerca de 3 semanas pra trocar por completo a camada cornea
Hiperplasia(proliferação fisiológica)
Neoplasia(proliferação anormal)
Displasia(maturação anormal)
Metaplasia(conversão de tecido) &nbsp;