gi psik baru
TRANSCRIPT
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FAALSISTEM PENCERNAAN
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ORGAN SISTEM PENCERNAAN
Meliputi : 1. Mulut + Kelenjar Saliva2. Pharynx3. Esophagus 4. Lambung5. Usus Halus (Duodenum,jejunum,ileum)6. Colon – Sigmoid – Rectum – Anus 7. Pancreas (Fungsi Eksokrin)8. Hepar9. Kandung Empedu
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Proses dalam Sistem pencernaan :
Makanan + air
sekresi Pencernaan
motilitas absorbsi V. porta
hepar
V.hepatika
Feses V. Cava Inferior
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SIFAT UMUMDinding UsusLapisan: dari luar ke dalam 1. Serosa 2. Otot longitudinal3. Otot sirkuler 4. Sub mukosa 5. Mukosa
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Pengontrolan1. Syaraf : - Intrinsik - Pleksus myenterikus Aurbach - Pleksus submukus Meissner - Ekstrinsik- Syaraf otonom - Simpatis - parasimpatis2. Hormon : - Gastrin - Kholesistokinin - Sekretin
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PENGONTROLAN SARAF1. Sistem persarafan Enterik a. Pleksus Myenterik Auerbach Letak : ant lap.otot longitudinal - sirkuler
Sifat : motorik - mengontrol gerak usus b. Pleksus submukus Meissner
Letak : di lapisan submukosa Sifat : sensorik - mengontrol sekresi
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a. Parasimpatik : N. Vagus - meningkatkan gerak/sekresi ususb. Simpatik : - menurunkan gerak / sekresi usus
2. Otonomik
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Refleks Gastrointestinal
1. Refleks myenterik : Pleksus Auerbach & Meissner2. Dari usus prevertebral gl simpatik usus
Refleks Gastrokolik Refleks EnterogastrikRefleks Kolonoileal
3. Dari usus medulla spinalis /otak ususRefleks defekasi
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Refleks myenterikTimbul : bila usus terisi makanan merangs Miesnerr / Auerbachrefleks gerak usus - refleks sekresi usus
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Refleks Gastrokolik Signal dari Lambung (mis. Lambung yg terisi makanan / irritasi ) menimbulkan refleks di kolon (meningkatkan gerakan kolon: gerak mass)
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Refleks Enterogastrik Signal dari usus, mis: - usus penuh / infeksi / irritasi - mengandung banyak protein, lemak - osmol, pH belum netral timbul refleks hambatan pengosongan
lambung
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.Refleks Kolonoileal- Signal dari kolon ( mis. Kolon yg penuh / infeksi / irritasi) timbul refleks hambatan pengosongan ileum
Refleks defekasiTimbul bila: Rektum terisi feses
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Hormon pencernaan1. H.Gastrin : sekresi di lambung2. H. Kholesistokinin : sekresi di duodenum3. H. Sekretin : sekresi di duodenum
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MULUT
Proses pencernaan secara : - Mekanik : mastikasi - Kimia : bantuan saliva (enzim ptyalin)
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Saliva mengandung :
- Alpha amilase (ptyalin) : f/ mencerna amilum
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Proses Pencernaan di mulut : PtyalinAmilum Polisakarid
Proses Absorbsi di Mulut
- hanya untuk obat-obatan
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OESOPHAGUSFungsi : - tempat lewat mkn dari mulut lambung - (tak ada sekresi enzim tak ada pencernaan) salivamakanan Bolus mastikasi