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Samenvatting H.50
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Samenvatting H.50 functionele biologie
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Funbio samenvatting H.50Hoe sterker de stimulus, hoer meer
actiepotentialen er worden afgegeven.
Amplificatie versterking tijdens transductie (gebeurt veel door middel van
neurotransmitters)
Adaptatie afname van frequentie in sensorische neuronen ter preventie van overload
(verschilt per zintuig)
Verschillende sensorische receptoren (indeling op modaliteit, vorm van boodschap, en
stimulus):
Mechano receptoren ( meten vormverandering) tast, gehoor, evenwicht, spierpoeltje
Electro-magneto receptoren infrarood, magnetisme, zicht
Chemo receptoren (meten osmo en pH) smaak, reuk
Thermo receptoren koud en warmte
Nociceptoren/pijn receptoren
Mechanoreceptoren reageren op fysische vormverandering door druk, rek, beweging en
geluid. Ionkanalen in membranen verbonden aan interne of externe celstructuren, gaan open -
> depolarisatie of hyperpolarisatie.
Interoreceptoren reageren op prikkels van het interne milieu (chemoreceptoren).
Exteroreceptoren reageren op prikkels van buiten het lichaam (smaakzintuig, oog)
Proprioreceptoren receptoren die gevoelig zijn voor info van spieren en gewrichten
(spierspoeltjes en peeslichaampjes)
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