Kleine verschillen in concentratie
van lading => potentiaalverschillen
Membraanpotentiaal= binnenzijde
is negatiever dan buitenzijde
2
, b. Uitwisseling
Uitwisseling tussen de verschillende compartimenten:
- Water
- Ionen
- Moleculen met signalisatie/metabole functies
Samenstelling van de compartimenten CONSTANT
Homeostase = constant houden van een lichaamstoestand door regelsystemen
Allostase= constant houden van een lichaamstoestand door verandering
! Minste vocht in beenderen
! Meeste vocht in hersenen
! Kinderen hebben grotere waterinhoud, ze verliezen meer door grotere
oppervlakte/volume verhouding
Hoofdstuk 2: overzicht transporten
Membranen selectief doorlaatbaar
Transport over membranen
3
, 2.1 Passief transport
- Spontaan
- Geen energie
- Met concentratiegradiënt mee
2.2 Actief transport
- Niet spontaan
- Energie nodig
- Tegen de concentratiegradiënt in
Primair actief transport Energie uit ATP Na/k pomp verbruikt ATP
om concentratie K binnen
hoog te houden
Secundair actief transport Energie uit spontaan
transport
4
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