Transport of Oxygen in Blood and Tissue Fluids

8/17/2019 Transport of Oxygen in Blood and Tissue Fluids

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Transport of Oxygenin Blood and tissue

uidsDR AMNA TAHIR


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DIFFUSION OF O!"#N FROM TH# A$%#O$ITO TH# &U$MONAR! 'A&I$$AR! B$OOD

• PO2 Of gaseous oxygen in the alveoli =

104 mm Hg

• PO2 Of venous blood entering the

pulmonary capillary at its arterial end =40mm Hg

• Initial pressure dierence= 104!40=

"4mm Hg• PO2 Of the blood rises to that of

alveolar air by the time the blood hasmoved a third of the distance throughthe capillary


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#p ta$e of oxygenby the pulmonary

blood


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&'()*PO'& O+ O,-%.) I) &H.

('&.'I(/ /OO

• 3 O+ the blood that enters theleft atrium 5ith PO

2= 104 mmHg

•

2 O+ the blood has passed thebronchial circulation 6 *H#)&./OO7 5ith PO

2=40 mmHg

•

8enous admixture of blood• PO2 of the blood pumped by

aorta = 9 mmHg


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DIFFUSION OF O!"#N FROMTH# RI&H#RA$ 'A&I$$ARI#S

INTO TH# TISSU# F$UID• PO2 at the arterial end= 9

mmHg

•

PO2 in the interstitial :uid thatsurround the tissue cells= 40mmHg

• &issue PO2 is determined by 2

factors1; 'ate of oxygen transport to

tissues in the blood

2; &he rate at 5hich the oxygen is


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DIFFUSION OF O!"#N FROM TH# RI&H#RA$'A&I$$ARI#S TO TH# TISSU# '#$$S

• Intracellular PO2 ranges 9!40

mmHg

•

(verage 2< mmHg• 1!< mmHg is reuired

• /arger safety factor


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'O/. O+ H.>O%/OI) I) O,-%.)

&'()*PO'&

• ? is carried in chemicalcombination 5ith Hb

•


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Transport of Oxygen in Blood and Tissue Fluids

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