materi histologi: jaringan epitel
TRANSCRIPT
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JARINGAN EPITEL
Melapisi permukaan tubuhBerperan pd homeostasis tubuhTersusun rapat, tidak ada jar.ikatinterselular, tdk ada pembuluh darahBerasal dari 3 macam lapisan:ektoderm, mesoderm, & endoderm
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JARINGAN EPITEL
Ektoderm epidermis pd kulitMesoderm epitel pd pleura,perikardium, peritoniumEndoderm epitel pd saluranpencernaan
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FUNGSI EPITEL
Protektif terhadap:kerusakanmekanik, kehilangan cairan, invasibenda asing.Metabolik:Pertukaran metabolit absorpsi,
ekskresi, sekresi.Kelenjar (endokrin & eksokrin)• Alat indra (epitel sensorium)
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EPITEL
EpitelPelapis
SELAPIS
Squamous
Kuboid
KolumnarPseudostratifikatum
BERLAPIS
Squamous
Kuboid
Kolumnar
Transisional
KELENJAR
PEMBAGIAN EPITEL
EksokrinEndokrin
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Bangunan khususpermukaan epitel
Mikrovillus: tonjolan sitoplasma, utkmemperluas permukaan meningkatkankapasitas absorpsi. Mis: lumen ususCillium: kinetocillia (bergerak aktif) &strereocillia (tdk dpt bergerak aktif)Myoephiteliocytus: filamen kontraktilmemeras & mengeluarkan isi sel. Mis: pdkelenjar ludah, kelenjar payudara
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Fungsi: pertukaran nutrien, sampahMetabolik, & pertukaran gasMembantu difusi, osmose, filtrasi.Contoh: alveoli, ginjal
EPITEL SQUAMOSUM SIMPLEKS(Epitel pipih selapis)
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EPITEL CUBOID SIMPLEKS
Saluran kelenjar,Tubulus ginjal
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EPITEL COLUMNAR SIMPLEKS
Biasanya utk fungsi absorpsi,Sekresi.Terdapat di: duktus kelenjarEksokrin, usus halus
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EPITEL PSEUDOSTRATIFICATUM
Di permukaan saluran pernafasan
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EPITEL SQUAMOSUM STRATIFICATUMCORNIFICATUM
Contoh: di kulitMelindungi terhadap gesekan, invasi bakteri
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EPITEL SQUAMOSUM STRATIFICATUMNON-CORNIFICATUM
Contoh: cavum oris, esofagusUtk proteksi, lubrikasi selama proses mengunyah & menelan
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EPITEL TRANSISIONAL
Contoh: di epitel kandung kemih