ï»¿ What is partial pressure ? How does it help in gaseous exchange during respiration ? from Biology Breathing and Exchange of Gases Class 11 Assam Board

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What is partial pressure ? How does it help in gaseous exchange during respiration ?

Partial pressure : It is the pressure exerted by individual gas in a mixture of gases.

Air is a mixture of gases like O2, CO2, N2Â etc. The partial pressure exerted by O2Â is designated as pO2. It is called partial pressure of O2. Similarly partial pressure of CO2Â is written as pCO2.

Due to pressure gradient Â and difference in the partial pressure the gase move from the region of their higher partial pressure to the region of their lower partial pressure.

Thus, O2Â from alveolar air (High pO2) diffuses into blood (having low pO2)Â till pO2.Â
CO2Â from blood (High pCO2) diffuses into alveoli ( having low pCO2)Â .Â Thus, partial pressure helps in gaseous exchange.

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

95 mm Hg
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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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