TIM HISTOLOGI - staffnew.uny.ac.idstaffnew.uny.ac.id/upload/132300162/pendidikan/Sel.pdfMengontrol...
Transcript of TIM HISTOLOGI - staffnew.uny.ac.idstaffnew.uny.ac.id/upload/132300162/pendidikan/Sel.pdfMengontrol...
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SELSEL
TIM HISTOLOGI
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SEL
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SELSEL
� Unit terkecil organisme
� Struktur: nukleus, sitoplasma, membran plasma
� Nukleus: nukleolus, karyoplasma (sitoplasma inti),
karyolemma (membran inti), kromatin.
� Sitoplasma: komponen struktural (organella),
komponen nonstruktural (inclusiones= bhn-bhn yg
masuk sel, butir-butir/bercak-bercak, misal:
granulum glikogen)
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BagianBagian NukleusNukleus: : KromosomKromosom
-Biasanya dlm bentuk kromatin
-Mengandung informasi genetik
-Menyusun DNA
-Menebal saat pembelahan sel
-Jumlah: pd mns 23 pasang
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BagianBagian NukleusNukleus: : MembranMembran intiinti
� Mengelilingi nukleus
� 2 lapis
� Lalu lintas transpor nukleus
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BagianBagian NukleusNukleus: : nukleolusnukleolus
� Bentuk sferis
� Tampak saat sel tidak membelah
� Mengandung RNA
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MitokondriaMitokondria
� Mempunyai 2 lapis membran: membranluar & membran dalam (terdapat krista)
� Reaksi kimia utk menghasilkan energiterjadi di krista
� Mengontrol kadar air & material lain dlmsel
� Daur ulang & penguraian protein, lemak, & KH
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RibosomRibosom
� Tiap sel mengandung ribuan ribosom
� ‘Pabrik’ protein
� Tipe diam (stasioner): di retikulum
endoplasma bergranula
� Tipe bergerak (mobile): melepaskan
protein scr langsung ke sitoplasma
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RetikulumRetikulum
endoplasmaendoplasma
� Jaringan tubuler, menyebar sampai
membran inti
� Berperan pd sistem transpor sel
� Tipe tdk bergranula: sdkt ribosom
� Tipe bergranula: kaya ribosom
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AparatusAparatus GolgiGolgi
� Struktur membran dekat nukleus
� Terdiri atas lapisan-lapisan, membentuk
suatu ‘kantong’
� Mengemas protein
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LisosomLisosom
� Mencerna protein, lemak, KH
� Mengirim material yg tdk tercerna ke
membran sel utk dibuang
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SentriolSentriol
� Organella silindris, berpasangan, dekat
nukleus
� Terlibat dlm pembelahan sel
� Terdiri atas 9 saluran, masing-masing
mengandung 3 saluran kecil
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MembranMembran
PlasmaPlasma
� Membran yg mengatur lalu lintas selular
� Mengandung protein (abu-abu)
� Mengandung lapisan fosfolipid 2 lapis
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ORGANELLAORGANELLA
� Sintesis, absorpsi, sekresi: Ribosom,RER,
RES, ap.golgi, lisosom, peroksisom
� Support/movement: mikrotubulus,
mikrofilamen
� Energetics: mitokondria
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SIKLUS SELSIKLUS SEL
� Interfase: 12-24 jam pd jaringan mamalia;
Sel scr terus menerus membentuk RNA,
menghasilkan protein, & bertambah
ukurannya
� Dibagi menjadi 4 tahap: Gap 0 (G0), Gap 1
(G1), fase S (Synthesis), Gap 2 (G2).
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SIKLUS SEL: G0SIKLUS SEL: G0
� Saat sel akan keluar dr siklus & berhenti
membelah
� Periode istirahat (sementara/permanen)
� Contoh yg permanen: sel saraf (sel yg
mencapai tahap akhir perkembangan &
tidak membelah lagi).
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SIKLUS SEL: G1SIKLUS SEL: G1
� Sel bertambah ukuran, menghasilkan RNA,
dan membentuk protein
� Mempersiapkan sintesis DNA
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SIKLUS SEL: FASE SSIKLUS SEL: FASE S
� Menghasilkan 2 sel anakan
� Replikasi DNA
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SIKLUS SEL: G2SIKLUS SEL: G2
� Gap antara sintesis DNA & mitosis
� Sel terus tumbuh & menghasilkan protein
baru
� Di akhir gap, kontrol utk menentukan
apakah sel siap memasuki fase mitosis (M)
& membelah
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FASE PEMBELAHAN SEL (MITOSIS) :
INTERFASE
Nukleus terlihat, membran inti ada,
kromosom tidak terlihat
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PROFASE
Kromosom tampak di tempat nukleus berada,
membran inti tidak ada
P � fase pertama mitosis
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METAFASE
Spindle (S) komplit, kromosom tertata di ekuator.
M � metafase
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ANAFASE
Kromosom yg bereplikasi bergerak menjauh menuju
kutub . A � anafase
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TELOFASE
Kromosom di kutub, membran inti komplit
Saat nukleus mpy membran inti, nukleolus terbentuk,
maka mitosis komplit.