ï»¿ How does haemoglobin help in transport of oxygen from lung to tissue ? from Biology Breathing and Exchange of Gases Class 11 Assam Board

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How does haemoglobin help in transport of oxygen from lung to tissue ?

Haemoglobin is a red coloured iron containing pigment present in theÂ RBCs. O2Â binds with haemoglobin in a reversible manner and formsÂ oxyhaemoglobin.

Each haemoglobin molecule can carry a maximum ofÂ four molecules of O2. Binding of oxygen with haemoglobin is primarilyÂ related to partial pressure of O2.Â

The high pO2, low pCO2, lesser H+ concentrationÂ and lower temperature in theÂ alveoliÂ areÂ favourable for the formation of
oxyhaemoglobin, whereas in the tissues,
low pO2, high pCO2, high H+Â concentration and higher temperature exist which favours dissociation of the oxygen from the haemoglobin. Thus,Â O2 gets bound toÂ haemoglobin in the lung surface and getsÂ dissociated at the tissues.Â

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What is the partial pressure of oxygen in Â oxygenated blood ?

95 mm Hg
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By what amount the solubility of carbondioxide is more than the solubility of oxygen?

20 - 25 times
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Name the cavity having lungs.

Thoracic cavity.
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70% of carbondioxide is transported as ?

Bicarbonate
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Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
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