ï»¿ Â Discuss the transportation of oxygen. from Biology Breathing and Exchange of Gases Class 11 Assam Board

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Breathing and Exchange of Gases

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Â Discuss the transportation of oxygen.

Transportation of oxygen : It ctake splace in the following way :

1. In solution form : Oxygen is less dissolved in plasmaâ€“about 3% gets transported in solution form.

2. As oxyhaemoglobin : Oxygen combines with haemoglobin to form oxyhaemoglobin. One molecule of haemoglobin combines with four molecules of oxygen to form oxyhaemoglobin.Â In the alveoli thereÂ is high pO2, low pCO2, lesser H+ concentrationÂ and lower temperature, these factorsÂ favour the Â formation ofÂ oxyhaemoglobin. Whereas in the tissues,Â where low pO2, high pCO2, high H+Â concentration and higher temperature exist,Â . Since the Haemoglobin molecules take oxygen from respiratory organs and give oxygen to the cells of the body.

Fig. Diagram of the exchange of gases

About 97% oxygen is carried in combination with haemoglobin.

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

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

20 - 25 times
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Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
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