Rubuta Chordates: siffofi na waje da kuma na ciki tsarin

Type tsirkiya yana da fiye da dubu 40. Rayuwa jinsunan. Wannan ya hada da bescherepnyh (tunicates da Amphioxus) da kuma girman kwanyar (cyclostomes (lamprey), kifi, halittar dabba mai kafafuwa, da abubuwa masu rarrafe, da tsuntsaye da kuma dabbobi masu shayarwa). Wakilai daga irin wannan da ake samu a duniya da kuma a duk wuraren. Mafi yawa daga chordates ne aiki, mobile salon, amma akwai nau'in da ana haɗe zuwa substrate - tunicates. Girma da kuma nauyi bambanta a irin da wannan ya dogara da irin yanayi da kuma dabbobi habitats.

Duk da cewa dabbobi suna hade a cikin irin tsirkiya, sosai daban-daban a cikin bayyanar, fasali na ciki tsarin, salon da kuma yanayi, suna da wasu na kowa siffofin. Don sanin kama taimaka sifofinsu chordates.

All chordates da:

• Axial kwarangwal, wanda aka wakilta tsirkiya a bescherepnyh da kuma kashin baya a girman kwanyar. A kwarangwal yana da siffar tufka aikin wani Tallafa aiki da kuma bada elasticity jiki.

• Gill slits a makogwaro. A protostomes kwayoyin da cewa rayuwa duk lokacin da a cikin ruwa kuma kada ku bar shi, gill slits kasance cikin rayuwa. Kuma deuterostome wanda ya bar cikin ruwa habitats, sa'an nan a mayar da shi baya (dabbobin ruwa, Whales, crocodiles), kuma ƙasar dabbobi Gill slits zama kawai a wasu matakai na amfrayo ci gaba, sa'an nan bace. Maimakon haka, suna aiki huhu - numfashi terrestrial jikinsu.

• Jamhuriyar juyayi tsarin (CNS), wanda shi ne mai tube located a gefe na baya. A m chordates ne m tube zauna cikin rayuwa, kuma a cikin mafi girma dabbobi ne zuwa kashi kwakwalwa da kuma laka. A jijiya endings, wanda mika daga tsakiya m tsarin, na gefe m tsarin form.

• Sistem rufaffiyar tsarin. The zuciya, kamar na tsarin jijiya tube ne ventral sashi na jiki.

Chordates da rarrabe dabiu a cikin wani jinsin, saboda su hanyar rayuwa da kuma mazauninsu, kazalika da adapting to shi. Bugu da kari a cikin ãyõyin bambance-bambance daga sauran kwayoyin a chordates kuma da kamance da sauran dabbobi. Wadannan kamance:

• Bangarorin fasali da cewa shi ne muhimmi lebur tsutsotsi, kwari da sauran kwayoyin.

• Overall (in ba haka ba da sakandare jiki rami), a cikin abin da kayan ciki suna located. Secondary rami ta bayyana a annelids.

• Da sakandare bakin wanda aka kafa a gastrula mataki da nasara bango.

• Metameric tsari na jikuna (segmental), a fili da aka bayyana a cikin tayi mataki da kuma a cikin m chordates, a adult dabbobi za a iya gani a cikin tsarin da tsokoki da kuma kashin baya axis. Saboda irin wannan tsirkiya nuna alamun kama zuwa annelids da kuma kwari.

• A gaban sashin jiki da tsarin - Sistem, na numfashi, juyayi, narkewa kamar, excretory, haihuwa.

Saboda haka, da irin tsirkiya hadawa dabbobi, wanda aka halin da hadin fasali, da kuma kullum, gaban gill slits a farkon matakai na ci gaba da zargin da ciki kwarangwal - da guitar, a kan wanda aka located da na tsarin jijiya tube. A karkashin tsirkiya ne narkewa kamar bututu.