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TELNÍ TEKUTINY obsahuji jako hlavni slozku vodu. U dospelého cloveka ciní její podil na telesné hmotnosti asi 53 %. Je v ní rozpusteno moho anorganických a organických látek. Voda je prostredím, ve kterém probihaji vsechny biologické deje. Vetsí cást vody je v bunkách jako nitrobunená tekutina (32 b %). Mimobunená tekutina (21 %) se delí na: ロ krev, • mizu, • tkánovy mok. Krev, míza a tkáñovy mok tvori vnitiní prostre- dí. Prorady vznam má krev. Vzniká z ní tkánový mok; z tkáñového moku se tvori míza. Bunky tkáni neustále odcerpávají z krve Ziviny a odevdávají do ní plodiny metabolismu. Kazdá zmena je rychle upravována, takze vnitini prostre- dí se udrzuje stálé. Stálost nitiního prostredí se na- zývá homeostáza. O KREV Funkce krve jsou mohostranné: a) specifické: - udrzovni homeostázy (osmotického tlaku, pH) - obranné - schopnost srázení; b) transportni: - prenáseni dýchacich plynu - rozvod Zivin a odvádeni zplodin - ucast na tizeni (prenásenim hormoni, vitaminủ) - rozvod tepla po tele (vyrovnává teplotni rozdily mezi orgány). Slození krve Krev je Cervena, neprúhledna kapalina, slozena 7 krevní plazmy a z krevnich telisek. cloveka tvori cca 8 % z celkové hmotnosti. Telo muze ob- sahuje 5-6 1 krve, telo zeny 4,5 1. Organismus sne-se bez potizi trátu asi 0,5 1 krve. • Krevní plazma je tekutou slozkou krve. Je pri- hledná a má slabe nazloutlou barvu. Obsahuje asi 91 % vody, 8 % rozpustených organických látek, hlavne bilkoviny (albuminy, globuliny, protrombin, fibrinogen) a glukózu. 1 % tvori rozpustené anor-ganické látky (nejvice chlorid sodny a hydrogen-uhlicitan sodný). Anorganické látky udrzují stálé pH a stalou osmotickou hodnotu plazmy, ktera odpovídá 0.9% roztoku chloridu sodného (fyziolo- gický roztok). Stálá hodnota pH plazmy je 7,4.
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