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Physiology

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Respiration

Question
9 out of 16
 

The normal value of P50 on the oxyhaemoglobin dissociation curve in an adult is -



A l.8 kPa
B 2.7 kPa
C 3.6 kPa
D 4.5 kPa

Ans. C 3.6 kPa

I. P50 is the PO2 at which hemoglobin is half (50%) saturated with O2­

II. It is the index of affinity of hemoglobin for oxygen Q. Higher the P50, the lower the affinity of hemoglobin for Oxygen.

III. Under normal conditions

a. WhenHb is normal b. PaCO2 is 110 mm Hg

c. 'Temperature is 37oC d. 2, 3 DPG is 15 mol/gm of Hb

IV. The value of P50 is 25 mm Hg - 3.6 kPa.

V. Note 1 mm Hg = 0.14 kPa

Respiration Flashcard List

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