Tampon bicarbonates / acide carbonique Flashcards

1
Q

Formule et lieu de l’acide carbonique

A

H2CO3
Dans les poumons

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2
Q

Formule et lieu de l’ion bicarbonate

A

HCO3-
les reins

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3
Q

Equation liant les ions bicarbonates et les acides carboniques

A

CO2+ H2O <->
H2CO3 <->
H+ + HCO3-

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4
Q

Ka de l’équation

A

[H+] . [HCO3-] / [CO2]dissous
= 10^-6,1 mol/L à 37°C

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5
Q

Si [H+] = Ka . [CO2]dissous /[HCO3-], que vaut le pH

A

pH = pKa + log [HCO3-]
/ [CO2]dissous

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6
Q

loi de Henry

A

[CO2]dissous = PCO2. sCO2

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7
Q

PCO2

A

Pression partielle du gaz carbonique au
dessus de la solution

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8
Q

sCO2

A

Coefficient de solubilité du gaz carbonique dans la solution
sCO2= 0,03 mmol/L/mmHg dans le plasma à 37°C

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9
Q

Relation d’Henderson-Hasselbach

A

pH =
pKa + log [HCO3-]/0,03 .PCO2
CF: les unités

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10
Q

ph artériel normal?

A

compris entre 7,35 et 7,45

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11
Q

Acidose

A

si pH < 7,35

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12
Q

Alcalose

A

si pH > 7,45

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