2nd meeting membrane potential.pptx
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7/24/2019 2ND MEETING MEMBRANE POTENTIAL.pptx
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POTENSIAL MEMBRANNovia Elisa, M.Si, Apt
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Outline Materi
Pendahuluan
Mekanismedasar
potensial aksidan potensial
istirahat
Tahappotensi
!aktorpen"etus
potensial aksi
Plateau danpen#e$a$n#a
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PEN%A&'L'AN
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Potensial mem$ran di dunia(armasi
O$at o$atkardiovaskul
ar )E*+ a$loker-
O$at o$atpenenan)hipnotiksedati(-
O$at o$antiepilep
Terapi "airan
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ontinued/
Peristi0a listrik di 1arin an $iolo is
per erakan ionmelintasi mem$ran
Tidak semua 1arin an dapa
men hasilkan sin#listrik #an$ermakna
Ion Na dan 2$erperan pentin potensial mem$ran
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ontinued/
Potensial listrik ada di dalam tu$uh msel
Potensial mem$ran mem$ran sel sara( danotot karena peru$ahan impuls elektrokimiatransmisi sin#al sepan1an mem$ran sel sara(dan ototSin#al sin#al listrik pem$a0a pesanmenentukan aktivitas sel
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li"k here to 0at"h video
http://var/www/apps/conversion/tmp/scratch_1/Action%20Potential%20Generation.mp4http://var/www/apps/conversion/tmp/scratch_1/Action%20Potential%20Generation.mp4 -
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Revie0materikomposisi"airan
tu$uh
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Mekanisme dasar potensialaksi dan potensial Istirahat
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Potensial Aksi
PrinsipMerupakan sin#al sin#allistrik #an $ermakna
%apat men alami
propa asi)pen andaan-
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POTENSIAL A2SI
Sin#al sara( ditransmisikan melaluipotensial aksi peru$ahan #an sin katpada potensial mem$ran men#e$ar disepan1an mem$ran sera$ut sara( Tiap potensial aksi dimulai den an
3 sudden change 4 dari mem$ran potensialistirahat )ne ati(- men1adi positi( lalu$erakhir den an nilai ne ati( #an drastis
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Ba aimana potensial mem$ranmen"apai threshold
'ntuk memulai potensial aksi threshold harus dile0ati
Threshold dile0ati input ion Na ke dalamsel sara( 5 ion 2
Penin katan potensial mem$ran #andiperlukan 67 89 m:
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Tahap tahap potensial aksidan potensial istirahat
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Tahap tahap potensial aksi danpotensial
TahapIstirahat Stimulasi
Aktivasi2anal Na
Ikanakti
Repolarisasi
Aktivasipompa
Na;2
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Tahap Potensial Aksi
Tahap Istirahat )Restin sta e-
Potensial mem$rane istirahat se$elum potensialaksi+
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Tahap repolarisasi
Mem$ran #an tadin#a permea$le terhadap ionnatrium )2anal natrium ter$uka- kanal natertutup kanal kalium ter$uka di(usi kake eksterior men em$alikan kondisi mem$rane
potensial istirahat potensial ne ati( repolarisasi mem$ran
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Click here to watch video
http://var/www/apps/conversion/tmp/BOOKS/Action%20Potential%20Generation.mp4http://var/www/apps/conversion/tmp/BOOKS/Action%20Potential%20Generation.mp4 -
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Plateau dan Pen#e$a$n#a
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Plateau pada potensial aksi
Pada $e$erapa kasus, mem$ran #antereksitasi tidak lan sun men alamirepolarisasi setelah depolarisasi Pot$ertahan mem$entuk plateau selama
$e$erapa milidetik repolarisasi ter1adiPlateau dapat memperpan1an periodedepolarisasi (enomena ini $iasa ter1adi diserat otot 1antun 9,= 9,8 detik
kontraksi otot 1antun
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Pen"etus plateau
Pen#e$a$ ter1adin#a plateau merupakan kom$inasidari $e$erapa (aktor
6. Pada otot 1antun ada dua tipe kanal #an$erhu$un an den an proses depolarisasi, #aitu+The usual voltage-activated sodium channels,
called fast channels (b). Voltage-activated calcium-sodium channels, called slow channels
Pem$ukaan (ast "hannels pun"ak potensial aksi
Pem$ukaan slo0 "hannel ion a masuk ke dalamsel plateau
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ontinued/
=. :olta e ated potassium hannel2anal ini ter$uka le$ih lam$an di$andundi$iasan#a atau tidak ter$uka le$ardela# kem$alin#a potensial mem$ran ke nilai
ne ati( ) >9 atau
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Potensial Aksi Berirama
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Potensial Aksi Berirama
Self-induced
$erulan
Potensialaksi
$erirama
Ritmepadadetak
1antun
Ritmeerakan
peristalti
k usus
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Ba aimana potensial aksi$erirama $isa ter1adi?
Mem$ran harus"ukup
permea$leterhadap ionNa;ion a
Pada tahapistirahat ) resting
stage), potensialtidak cukupnegatif
Auto mem$depolari@a
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Auto mem$rane depolari@ation
Ion Na atau amasuk kedalam sel
Penin katanvoltase
mem$ran positi(
Peninpermea$
mem$rkanater$
Ion Na kemasuk d
1umlah $
%epolarisasikem$ali
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T&AN2 O'
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