Summary
Samenvatting Nectar 4e ed vwo 5, hoofdstuk 11, Biologie
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In deze samenvatting wordt heel hoofdstuk 11 van biologie (vwo 5) behandelt.
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Biologie, $1
HEEREN Milieu
interne milieu →
cellen ,
bloed lymfe
, , weefsel vloeistof
Homeostase → Het constant houden van waarden met regel kringen
dynamisch evenwicht → waarden schommelen Rond de norm
Regelkring
Receptor → meet NORM
Regelcentpnum →
vergel ken met norm
EPPECTOR →
Zorgt voor effect .
-
effect
Receptor
Negatieve terugkoppeling > Een afw king
EPPECTOR
van de norm tegenhouden .
De waarde b sturen in
richting van de nor m .
Regelkring lichaamstemperatuur
kern : stabiel : Receptor hypothalamus > stabiel voor
werking enzymen
schil : variabel : Receptor huid
EPPECTOREM → spieren en spiertjes in de vaat wanden in de huid ( kippenvel .
Rillen .
beweging ,
aangepaste doorbloeding en zweetklieren .
koorts
De NORM wordt DOOR hypothalamus verhoogd .
(
cytokinen )
persoon voelt zich
Rillepnig .
Stimuleert afweer .
infectie zweten
over > norm
omlaag >
Onderkoeling
Te Lage kerntemperatuur >
enzymen trager hoge temp
beschadigen
'
.
Rillen Bloedvaten
'
. klappertanden . vernauwen >
minder bloed naar schil .
ij ijij
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