Sura ya 4: Ngazi ya Tissue ya Shirika
- Page ID
- 184009
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- 4.2: Aina ya Tishu
- Neno tishu hutumiwa kuelezea kikundi cha seli zilizopatikana pamoja mwilini. Seli ndani ya tishu zinashiriki asili ya kawaida ya embryonic. Uchunguzi wa microscopic unaonyesha kwamba seli katika tishu zinashiriki vipengele vya kimaadili na hupangwa kwa muundo wa utaratibu ambao hufikia kazi za tishu. Kutokana na mtazamo wa mabadiliko, tishu zinaonekana katika viumbe ngumu zaidi. Kwa mfano, protists multicellular, eukaryotes kale, hawana seli kupangwa katika tishu.
- 4.6: Tishu za neva zinapatanisha Mtazamo na Majibu
- Tissue ya neva inajulikana kuwa ya kusisimua na yenye uwezo wa kutuma na kupokea ishara za electrochemical zinazotoa mwili kwa habari. Masomo mawili makuu ya seli hufanya tishu za neva: neuron na neuroglia. Neurons hueneza habari kupitia msukumo wa electrochemical, unaoitwa uwezekano wa hatua, ambazo zinahusishwa na biochemically na kutolewa kwa ishara za kemikali. Neuroglia ina jukumu muhimu katika kusaidia neurons na kuimarisha uenezi wao wa habari.