SURFA, sulfa, amali refleksist, ki odatan dar natijai angezishi pardai luobii rohhoi nafas (tavassuti balgam hangomi iltyaho- bn uevhoi nafaskashi yo dokhil shudani jismhon begona, masalan, chang, dud va gayra) ba vujud meoyad. Surfa yake az alomathoi asosii bemorii halqum, khirnoy, bronkhho va boftahoi shush meboshad. Hangomi, tars, khijolat va gayra ba angezishi rohhoi nafas ham markazi Surfa dar magzi sar ba tahayyuj meoyad va kas mesurfad. Surfa odatan az nafaskashii chuqur sarmeshavad; mushakhoi bronkhho, rohhoi nafas, shikam, diafragma tarang, surokhii ovozbaro rust, fishori qafasi sina baland megardand. Surfai davomnok va tez-tez, ki az illati jigar, pardai shush va baze digar uzvho ba vujud meoyad, baroi organizm zarar dorad, muvtazam baland shudani fishori dokhili sina va daruni bronkhho boisi paydoishi emfizemai shush gardida, ba dil jori shudani khunro dushvor mekunad, ki in ba noqisii kori dilu shush sabab meshavad.