Čulni sistem
TRANSCRIPT
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ČULNI SISTEM
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PODSETNIK-ULOGA NERVNOG SISTEMA? Upravlja radom celog organizma tj.
kontroliše rad svih sistema organa i uskađuje ih sa trenutnim potebama.
KAKO ON TO ZNA?
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RECEPTORI (PRIJEMNICI) Posebni organi ili ćelije koji su odgovorni za
registrovanje tj. reagovanje na promene u spolj. sredini i unut. tela.
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ČULNI SISTEM Čula nas snabdevaju informacijama iz okoline
i unutrašnjosti tela. Obaveštavaju organizam o promenama.
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PODSETNIK-DRAŽI? Svaka promena u spoljašnjoj i unutrašnjoj sredini koja
može da izazove reakciju tj. nadražaj u telu.
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U ODNOSU NA TIP DRAŽI ČULNI ORGANI MOGU BITI:hemoreceptorifotoreceptorimehanoreceptoritermoreceptori
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HEMORECEPTORI U NOSU
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HEMORECEPTORI NA JEZIKU
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FOTORECEPTORI U OKU
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MEHANORECEPTORI U UHU
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MEHANORECEPTORI I TERMORECEPTORI U KOŽI
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PREDAJA INFORMACIJE NERVNOM SISTEMU
1. Receptor2. Osećajni nervi3. Centar u kori velikog mozga
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ČULNI CENTRI U KORI VELIKOG MOZGA
ČEONI REŽANJ-mirisPOTILJAČNI REŽANJ-vid• TEMENI REŽANJ-osećaji iz kože, osećaji iz mišića, zglobova i unutrašnjih organa
• SLEPOOČNI REŽANJ-sluh i ukus
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OBLICI RECEPTORA:1. Pojedinačne čulne ćelije
U koži, mišićima, unutrašnjim organima
2. Čulni organi
Vida, sluha, ukusa, mirisa, ravnoteže
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ČULNE ĆELIJE U KOŽIbol
dodir
Hladnoća
toplota
pritisak
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Čulni organi glave
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Čulo vida
OPTIČKI NERV
Fotoreceptori mrežnjače oka
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Čulo ukusa
Čulne kvržice jezika
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Čulo mirisa
Receptorne ćelije
Nervna vlakna grade MIRISNI NERV
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Ušna školjka
Spoljašnji slušni kanal
Bubna opna
Puž
Slušne koščice :čekić, nakovanj i uzengije
Eustahijeva tuba
Čulo sluhaSlušni nerv
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POLUKRUŽNI KANALI
KOHLEARNINERV
ČULO RAVNOTEŽE
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Čulni organi unutrašnjih
organa
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Čulne ćelije u: crevima bešici krvnim sudovima
Itd.
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RECEPTORI U KRVNIM SUDOVIMA
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RECEPTORI U MOKRAĆNOJ BEŠICI
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KAKO RADE NAŠA ČULA?DRAŽ
RECEPTOR
OSEĆAJNA NERVNA VLAKNA
OSEĆAJNI CENTAR U MOZGU
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KOJA JE ULOGA ČULNIH ORGANA? Čulni organi registruju promene u spoljašnjoj
i unutrašnjoj sredini (draži) i te informacije prosleđuju nervnom sistemu koji omogućava reakciju.
Čulni organi sadrže specifične čulne ćelije tj. RECEPTORE koji reaguju na draži iz spoljašnje sredine.