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HOMEOSTASISDr. SUHAEMI, SpPD,FINASIM
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HOMEOSTASISHomeostasis, from the Greek wordsfor "same" and "steady," refers
to any process that living thingsuse to actively maintain fairlystable conditions necessary forsurvival…
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PENDAHULUAN
Manusia dapat hidup dilingkungan yang!ru ah u ah kar!na "!"punyai
k!"a"puan "!"p!rtahankan k!adaanlingkungan dala"nya# "ili!uint!ri!ur $.Hal ini akan "!lindungi s!l s!l ygt!rl!tak di dala" tu uh dari p!ru ahanlingkungan luar # "ili!u !%t!ri!ur $s!hingga "!n&a"in k!langsungan
hidup s!l s!l tu uh.
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PENTIN'N(A LIN')UN'AN DALAM (AN' STA*IL
+LAUDE *E NA D # Pran-is $ /0/1M!"p!rtahankan lingkungan dala" yg r!lati2sta il, 3rganis"! "ultis!l yg k3"pl!ks dapat
hidup ! as di lingkungan luar yg sangat!r4ariasi.5ALTE +ANNON # USA $1 Upaya"!"p!rtahankan k!adaan lingkungan dala"yang sta il s! agai h3"!3stasis, yang !rasaldari ahasa (unani kun36 h3"!3#sa"a$ danstasis # "!"p!rtahankan k!adaan $
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SE+TIONS OF HOMEOSTASIS
Homeostasis
The InternalEnvironment
ControlSystems
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SE+TIONS OF HOMEOSTASIS
FeedbackSystems in
Homeostasis
Body Systemsand
Homeostasis
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HOMEOSTASIS
Dala" "!ny!l!nggarakan h3"!3stasis initu uh harus s!nantiasa "!"antau adanyap!ru ahan7 nilai !r agai para"!t!r, lalu
"!ngk33rdinasikan r!sp3ns yg s!suais!hingga p!ru ahan yg t!r&adi dapat dir!da".Untuk itu s!l s!l tu uh harus "a"pu
!rk3"unikasi satu d!ngan lainnya.
)3"unikasi antar s!l ini "!rupkan "!dia yg"!n3pang p!ng!ndalian 2ungsi s!l atau 3rgantu uh.
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P!ng!ndalian yg paling s!d!rhanat!r&adi s!-ara l3kal # intrinsik $1dilakukan dgn k3"unikasi antar s!l yg
!rd!katan.P!ng!ndalian &arak &auh # !kstrinsik $l! ih k3"pl!ks dan di"ungkinkan"!lalui r!8!ks yang dapat "!li atkansist!" sara2 # l!ngkung r!8!ks $"aupun sist!" !nd3krin # p!ngaturan
u"pan alik $
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H3"!3stasis ini pada dasarnya adalahuntuk "!nsta ilkan -airan dis!kitar s!ls!l 3rganis"! "ultis!l yaitu -airan!kstra s!l #+ES $, yg "!rupakanint!r2a-! antara s! dan lingkungan luar.S!l s!l tu uh s!lain harus s!lalu asah,
harus pula "!ngandung 9at 9at t!rt!ntudala" kadar t!rt!ntu pula d!"ik!langsungan pr3s!s pr3s!s dala" s!l
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PA AMETE +ES (' HA US DIPE TAHAN)AN MELALUIHOMEOSTASIS
)adar nutri!n)adar O7 dan +O7
)adar sisa "!ta 3lis"!pH)adar air,gara" dan !l!ktr3lit
Suhu:3lu"! dan t!kanan
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Hyperthermia
Heatreceptors inthe skin
Hypothalamus
StressSensors Control
Center
Increasedactivity o
s!eat "lands
Increasedblood #o! to
the skinE$ectors
%erspirationevaporatescoolin" the
skinE$ect
Stress isreducedshuttin" do!nmechanism
Homeostatic &e"ulation o Body Temperaturethrou"h 'e"ative Feedback
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Homeostasis (sin" a 'eural%ath!ay
Controlcenter
Many homeostaticmechanisms use anerve path!ay in!hich to produce
their e$ects) Thesepath!ays involvean a$erent path!hich brin"ssensory messa"esinto the brain andan e$erent path!hich carriesout"oin" nerve
messa"es toe$ectors)
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Homeostatic &e"ulation o Child Birththrou"h %ositive Feedback
%ressure o Fetuson the (terine ,all
'erve endin"s in the
uterine !all carrya$erent messa"es to the
Hypothalamus
%roduction and
&elease o O-ytocininto the Blood
Increasin"stren"th o uterinecontractions
Intensi.es
The birth o the child !ill brin" this process to a close)
Other e-amples o positive eedback re"ulation occurdurin" milk letdo!n and blood clottin")
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Ha"pir s!"ua p!nyakit "!rupakank!gagalan tu uh "!"p!rtahankanh3"!3stasis.
Lingkungan sangat dingin tanpa pakaian danp!rlindungan dapat !raki at 2atal &ikatu uhnya gagal "!"p!rtahankan suhus!hingga suhu inti tu uh turun.
Tanggung &a;a d3kt!r dan para"!disadalah untuk "!" antu "!"p!rtahankanh3"!3stasis.
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