f n o i r nervous system d on sense organs r endocrine system
TRANSCRIPT
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Sistem endokrinSistem endokrin
Dewi PuspitaDewi Puspita
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Reg
ula
tio
n&
inte
grat
ion
of
the
bo
dy
Nervous system
Sense organsSense organs
Endocrine system
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Nervous system
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Sense organ
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Endocrine system
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The difference of nervous system and hormonal system
Sistem syaraf• Mediator molecules : Neurotransmitter
released locally in response to nerve impuls
• Site of mediator action : Close to site of release, at asynapse binds to receptor in postsinaptic membrane
• Target cells : muscle (smooth, cardiac and skeletal) cells, glands cells, other neurons
• Time to onset of action : typically within milliseconds (thousans of a second)
• Duration of action : Generally Briefer (miliseconds)
Sistem endokrin
• Hormone deliveres to tissue troughout thr body by flood
• Far from site of release (ussually), binds to receptors on or target cells
• Cells troughout the body
• Second to hours or days
• Generally longer (second to days)
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• hydrophilic
Peptide hormone
• Hydrophilic (- thyroid hormoneàhydrophobic)
Amine hormone
• Hydrophobicàneed protein
Lipid/steroid hormone
Hormone classification
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Hormone signaling pathway
• Hormonal signalling pathway involves hormone synthesis, storage (peptide and amine hormones only), release from endocrine cells, transport, receptor binding, release of or its breakdown products from the cells of the target organ, further transport and excretion
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Hormonal signalling from production to metabolism
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Hormone signalling process
sintesis
storage
release transport
Reseptor binding
release Further transport
excretion
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Feedback Loop
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The pituitary gland & Hypothalamus
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Pituitary / hipofise anterior
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Pituitary / Hipofise Posterior
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KELENJAR HIPOTALAMUSKELENJAR HIPOTALAMUS
•• TerletakTerletak dibawahdibawah otakotak besarbesar•• BerperanBerperan dalamdalam koordinasikoordinasi sistemsistem sarafsarafdandan sistemsistem endokrinendokrin tubuhtubuh•• HipotalamusHipotalamus menghasilkanmenghasilkan beberapabeberapa jenisjenishormonhormon yangyang disekresikandisekresikan langsunglangsung kekehipofisishipofisis..
ØØ GnRFGnRF (Gonadotropin(Gonadotropin ReleasingReleasing Factor)Factor)ØØ CrFCrF (Corticotropin(Corticotropin releasingreleasing Factor)Factor)ØØ TrFTrF (Tirotropin(Tirotropin ReleasingReleasing Factor)Factor)
BeberapaBeberapa jenisjenis hormonhormon yangyang disekresikandisekresikan oleholeh hipofisis,hipofisis,dihasilkandihasilkan oleholeh selsel--selsel hipotalamushipotalamus ::
ØØADHADH (Anti(Anti DiuretikDiuretik Hormon)/VasopresinHormon)/VasopresinØØ TSHTSH (Tiroid(Tiroid StimulatingStimulating Hormone)Hormone)ØØ OksitosinOksitosin
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KELENJAR HIPOFISISKELENJAR HIPOFISISKelenjarKelenjar hipofisishipofisis atauatau pituitaripituitari adalahadalah kelenjarkelenjar yangyangpalingpaling banyakbanyak menghasilkanmenghasilkan hormonhormon
LetaknyaLetaknya adaada didasardidasar otakotak (dibawah(dibawah hipotalamus)hipotalamus)
Kelenjar anterior hipofisis
Kelenjar posterior hipofisis
Kelenjar intermediet
hipofisi
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TARGET HORMONTARGET HORMON
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Hormon prolaktin
Hormon Somatotrof
Hormon Tiroid
Luteinizing hormon
Folicle Stimulating hormon
Hormon Adrenokortikotropik
KELENJAR ANTERIOR KELENJAR ANTERIOR HIPOFISISHIPOFISIS
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Hormon Oksitosin
Hormon ADH
KELENJAR POSTERIOR KELENJAR POSTERIOR HIPOFISISHIPOFISIS
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Melanocyte Stimulating Hormone
(MSH)
KELENJAR INTERMEDIET KELENJAR INTERMEDIET HIPOFISISHIPOFISIS
11 22
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KELENJAR TIROIDKELENJAR TIROID
Merupakan kelenjar yang terdiri dari folikel-folikel dan terdapat di depan trakea
Hormon yang dihasilkan:
Ø Hormon Tiroksin
Ø Hormon Triodontironin
Ø Hormon Kalsitonin
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HYPERTHYROIDHYPERTHYROID
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THIROID HORMONE REGULATES :THIROID HORMONE REGULATES :
GENE EXPRESSIONGENE EXPRESSION
TISSUE DIFFERENTIATIONTISSUE DIFFERENTIATION
GENERAL DEVELOPMENTGENERAL DEVELOPMENT
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THYROID HORMONETHYROID HORMONE
T3 : 3,5,3’T3 : 3,5,3’--TRIIODOTHYRONINETRIIODOTHYRONINE
T4 : 3,5,3’,5’T4 : 3,5,3’,5’--TETRAIODOTYRONINE (THYROXINE)TETRAIODOTYRONINE (THYROXINE)
NEED TRACE ELEMENT : IODINENEED TRACE ELEMENT : IODINE
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KELENJAR PARATIROIDKELENJAR PARATIROID
Merupakan kelenjar hasil penimbunanhormon somatotrof atau hormonpertumbuhan.
Hormon yang dihasilkan:
ØHormon Parathormon/parathyroid hormon
Fungsi umum kelenjar paratiroid adalah:
1. Mengatur metabolisme fosfor
2. Mengatur kadar kalsium darah
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• Kelenjar ini menghasilkan parathormon (PTH) yang berfungsi untuk mengatur konsentrasi ion kalsium dalam cairan ekstraseluler dengan cara mengatur : absorpsi kalsium dari usus, ekskresi kalsium oleh ginjal, dan pelepasan kalsium dari tulang.
• Hormon paratiroid meningkatkan kalsium darah dengan cara merangsang reabsorpsi kalsium di ginjal dan dengan cara penginduksian sel–sel tulang osteoklas untuk merombak matriks bermineral pada osteoklas untuk merombak matriks bermineral pada tulang sejati dan melepaskan kalsium ke dalam darah
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• Jika kelebihan hormon ini akan berakibat berakibat kadar kalsium dalam darah meningkat, hal ini akan mengakibatkan terjadinya endapan kapur pada ginjal.
• Jika kekurangan hormon menyebabkan kekejangan disebut tetanus.
• Kalsitonin mempunyai fungsi yang berlawanan dengan PTH, sehingga fungsinya menurunkan kalsium darah.
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KELENJAR TIMUSKELENJAR TIMUS
Merupakan kelenjar yang bertanggungjawab pada pertumbuhan manusia.
Fungsi kelenjar ini sebagai :
ØMengaktifkan pertumbuhan badan
ØMengurangi aktivitas pertumbuhan kelamin
Hormon yang dihasilkan:
ØHormon Timosin
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KELENJAR PANKREASKELENJAR PANKREAS
Merupakan sekelompok sel yang terletak pada pankreas, sehingga dikenal dengan pulau –pulau Langerhans.
Hormon yang dihasilkan:
Ø Hormon Insulin
Ø Hormon Glukogen
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LANGERHANS LANGERHANS èè αα CELLCELL : GLU: GLUCCAGONAGONHORMONEHORMONE
èè ββ CELL CELL : INSULIN: INSULIN HORMONEHORMONE
INSULININSULINHORMONEHORMONE
INSULIN STRUCTURE IS INSULIN STRUCTURE IS PROTEIN, PROTEIN, THAT IS CONSIST OF THAT IS CONSIST OF αα ––POLIPEPTIDPOLIPEPTIDEE AND AND ββ = = POLIPEPTIDAPOLIPEPTIDAEE ,, HAVE TWO DIPEPTIDE BOND HAVE TWO DIPEPTIDE BOND and ONE DISULFIDE BOND IN THE and ONE DISULFIDE BOND IN THE αα = PO LIPEPTIDE= PO LIPEPTIDE
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KELENJAR ADRENALKELENJAR ADRENAL
Terdiri atas dua jaringan aktif penghasilhormon yang secara struktur dan fungsinya berbeda, yaitu:
– adrenal korteks (luar)
– adrenal medulla (tengah)
Kelenjar ini berbentuk bola, atau topi yang menempel pada bagian atas ginjal. Pada setiap ginjal terdapat satu kelenjar suprarenalis .
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Tabel 6. Hormon dari kelenjar anak ginjal dan prinsip kerjanya :
hormon Prinsip kerja
Bagian korteks adrenal :
Mengontrol metabolisme
ion anorganik
Mengontrol metabolisme
glukosa
Bagian medula adrenal :
Adrenalin (epinefrin)
dan noradrenalin
Kedua hormon tersebut
bekerja sama dalam hal
berikut :
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Regulasi hormon adrenal
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Regulasi hormon medula adrenal
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• Stimulus yang mencekam menyebabkan hipotalamus mengaktifkan medula adrenal melalui impuls saraf dan korteks adrenal melalui sinyal hormonal.
• Medulla adrenal memperantarai respons jangka pendek terhadap stress dengan cara mensekresikan hormon katekolamin yaitu efinefrin dan norefinefrin.
• Korteks adrenal mengontrol respon yang berlangsung lebih lama dengan cara mensekresikan hormone steroid. (Campbell, 1952 : 146)
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ADRENAL HORMONEADRENAL HORMONE
ADRENAL ADRENAL GLANDGLAND
CORTEXCORTEX
MEDULAMEDULA H. KATEKOLAMINH. KATEKOLAMIN
1.1. ZONA GLOMERULOSA ZONA GLOMERULOSA
2.2. ZONA FASIZONA FASICCULATAULATA
3.3. ZONA RETIZONA RETICCULARISULARIS
MINERALOMINERALO--CCORTIORTICCOIDOID H.H.
--HGLUHGLUCCOOCCOROR--TITICCOID OID H.H.--ANDROGENANDROGEN H.H.
CCORTEORTEX X ADRENALISADRENALIS
CCORTIORTICCOSTEROIDOSTEROID H. :H. : 1.1. GLUGLUCCOOCCORTIKORTIKCCOIDOID
2.2. MINERALOMINERALOCCORTIKORTIKCCOIDOID
3.3. ANDROGEN ( SEX HORMON ANDROGEN ( SEX HORMON EE))
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KELENJAR KELENJAR ADRENAL ADRENAL KORTEKSKORTEKS
menghasilkan hormon :
1. mineralocoticoids, contoh: aldosteron, fungsi: mempertahankan kesetimbangan kadar Na dan K. Dengan cara meningkatkan kadar Na dan air darahdan menurunkan kadar K dlm darah.
2. Glukocorticoids, contoh: khususnya cortisol. Fungsi: regulasi metabolisme glukosa dan molekulorganic lainnya, resistensi terhadap stress dancounter respon inflamasi.
3. Gonadocorticoids: menghasilkan sex steroid (androgen) dalam jumlah yang tidak signifnifikan.
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KELENJAR KELENJAR ADRENAL ADRENAL MEDULAMEDULA
n Menghasilkan hormon epinephrine dan norepinephrine.
n Hormon epinephrine dan norepinephrine distimulasi langsung oleh sarafsimphatetik.
n Produksi meningkat pada saat terjadi stress dengan cara:
1. meningkatkan debar jantung
2. kontriksi pembuluh darah pada kulit
3. Kontraksi lympha (spleen)
4. Merubah glikogen menjadi glukosa.
5. menurunkan produksi enzim pada organ pencernaan
6. Berkeringat
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KELENJAR KELAMINKELENJAR KELAMIN
Terbagi atas dua kelenjar, yaitu:
– Kelenjar ovarium
– Kelenjar testis
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KELENJAR OVARIUMKELENJAR OVARIUM
n Menghasilkan Hormon estrogen, progesteron, relaxin dan inhibin.
n Estrogen dan progesteron berfungsi: membangun dan mempertahankan
karakteristik kelamin wanita: siklus mentruasi, kehamilan dan
perkembangan kelenjar mamae.
n Relaxin: membantu dilatasi uterus pada akhir kehamilan.
n Inhibin: Menghambat sekresi FSH pada akhir siklus menstruasi.
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Pengaruh LH dan FSH thd pematangan folikel
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KELENJAR TESTIS
n Kelenjar testes terletak didalam scrotum.
n Menghasilkan hormon : testosteron dan inhibin
n Testosteron: berfungsi membangun dan mempertahankan karakteristik
kelamin (seksual) pria dan regulasi spermatogenesis.
n Inhibin: Menghambat sekresi FSH untuk mengatur produksi sperma.
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Regulasi hormon pada laki-laki