Recebe o nome de hematose pulmonar a troca gasosa que ocorre entre o sangue e o ar existente nos pulmões. Este processo tem por finalidade a manutenção do equilíbrio ácido básico no organismo e é realizado por todos os vertebrados terrestres.
O oxigênio que é inspirado chega até os alvéolos pulmonares, onde ocorre a troca gasosa (através de suas finas paredes), com o sangue dos capilares, sendo que o oxigênio presente nestas estruturas passa para a corrente sanguínea (antes o sangue era venoso, passa a ser arterial) e o gás carbônico presente nos capilares passa para o interior dos alvéolos por difusão. Este gás, por sua vez, será eliminado para o ambiente durante o movimento de expiração, passando por todo o trato respiratório (bronquílos, brônquios, traquéia, laringe, faringe, fossas nasais ou pela cavidade oral).
Fonte:
http://www.infoescola.com/sistema-respiratorio/hematose-pulmonar/
Outras fontes e mais estudos: (aprimorando os conhecimentos)
http://www.mundoeducacao.com.br/biologia/hematose.htm
http://www.afh.bio.br/resp/resp2.asp
http://profs.ccems.pt/Palma/Ciencias/6%C2%BAano/Sistema%20Respirat%C3%B3rio/Humano/Jmatch2/alv.jpg
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