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Samenvatting zuur-base

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Samenvatting van de leertekst + notities les (mens met gezondheidsproblemen - zuur)

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Zuur-base evenwicht

1. Opfrissing zuren

 Geef H+ af aan de oplossing
 Anorganische zuren
 Binair: HCL
 Ternair: H2CO3

 Organische zuren of carbonzuren
 C3H6O3 (CH3-CHOH-COOH)

2. Opfrissing basen

 Kan H+ ionen binden in een oplossing
 Anorganische basen
 NaOH
 NH3 + H20  NH4+ + OH-

 Organische basen
 KWS + NH2 of aminogroep

3. pH en pH schaal

 pH: potentia hydrogenii
 pH-schaal: gebaseerd op de concentratie van vrije H+ in een waterige oplossing
 H+ uitgedrukt in mol/l
 H+ in zuiver water = 10-7 mol/l
 pH = - log H+




4. Zuurtegraad van het bloed
4.1 Zuurtegraad van het bloed
 Zuur-base evenwicht
 Dagelijks wordt veel H+ geproduceerd als product van metabolisme
 Normale pH van de lichaamsvloeistoffen ligt tussen pH 7,35 en pH 7,45
o pH > 7,45 is alkalose (te basisch)
o pH < 7,35 is acidose ( te zuur)

 Buffersystemen!

, 4.2 Opfrissing voornaamste bronnen




Relatie tussen CO2 en de pH van het plasma




4.3 Buffersystemen

 Gaan veranderingen in de pH tegen
 Drie belangrijke buffersystemen in het lichaam
 Eiwitbuffersysteem: plasma-eiwitten (in ECF) en hemoglobine (in ICF)
 Bicarbonaatbuffersysteem (in ECF)
 Fosfaatbuffersysteem (in ICF)

 Handboek anatomie p 760!!
 Aminozuur:




4.4 Compensatiemechanismen

 Respiratoire compensatie
 Wijzigingen in de ventilatie leiden tot wijzigingen in de pH door toename of afname
van CO2
 Beïnvloedt het bicarbonaatbuffersysteem

 Renale compensatie
 De nieren variëren de afgifte van H+ en terugresorptie van bicarbonaat in reactie op
de pH van het ECF

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