Fisiologia das Secreções Salivares e Gastrintestinais

Lima, Vilma ; Melo, Iracema Matos ; Araújo, Vilana Maria Adriano ; Diniz Filho, Jairo

Resumo:

A função do sistema digestório consiste em prover nutrientes para o corpo enquanto o alimento transita pelo tubo digestivo desde a boca, seguindo pelo esôfago, o estômago e os intestinos, antes de ser esvaziado. O trato gastrointestinal realiza a digestão dos alimentos, porém não digere a si mesmo. Abriga grande quantidade de bactérias, mais que o próprio número de células do corpo humano, sendo que o ácido clorídrico gástrico, bem como o muco, previnem a multiplicação anormal da microbiota e acúmulo de seus produtos, prevenindo danos aos órgãos. Os mecanismos por trás dessas habilidades variam, mas uma das principais razões refere-se às suas secreções glandulares (Johansson et al., 2013).

Assim, as glândulas secretoras desempenham duas funções primárias: a secretora, com a produção de enzimas e muco, e a função de proteção do tubo digestivo. As secreções das glândulas do trato gastrintestinal e órgãos associados ocorrem em resposta aos alimentos que trafegam ao longo do tubo digestivo, tornando-os, portanto, passíveis de serem absorvidos. Desse modo, para cada tipo de secreção é importante compreender sua composição e sua função no organismo, além de sua formação e seu controle (Fry, 2009).

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DOI: 10.5151/9788580391893-19

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Como citar:

LIMA, Vilma; MELO, Iracema Matos; ARAÚJO, Vilana Maria Adriano; DINIZ FILHO, Jairo; "Fisiologia das Secreções Salivares e Gastrintestinais", p. 479-522. Sistema digestório: integração básico-clínica. São Paulo: Blucher, 2016.
ISBN: 9788580391893, DOI 10.5151/9788580391893-19