Tavassuti uzvhoi nafaskashi mubodilai gazho bayni organizm va muhiti atrof ba amal meoyad. Dar natija odam oksigenro furu burda, gazi karbonatro khorij mekunad. Oksigeni dokhilshuda, dar ravandi oksidshavii moddahoi organiki faolona ishtirok mekunad. Hujayraho ba onho ehtiyoji kalon dorand. Dar natijai oksidshavii har kadom moddai organiki gazi karbonat va ob hosil …

Harakathoi nafasgiri. Nafas giriftan va nafas barovardan yakdigarro mavzun ivaz karda, ba vositai shush guzashtani havo va avotozakunii shushro tamin mesozand.  Ivazshavii nafasgiri va nafasbaroriro markazi nafasgiri tanzim mekunad, ki on dar magzi darozruya joygir ast. Dar markazi nafasgiri impulsho muntazam ba amal omada, tavassuti asabho ba mushakhoi bayni qaburgagi …