## Chapter Chosen

Breathing and Exchange of Gases

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CBSE Gujarat Board Haryana Board

## Previous Year Papers

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Class 10 Class 12
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, Netc. The partial pressure exerted by O2 is designated as pO2. It is called partial pressure of O2. Similarly partial pressure of CO2 is written as pCO2.

Due to pressure gradient  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, O2 from alveolar air (High pO2) diffuses into blood (having low pO2) till pO2.
COfrom blood (High pCO2) diffuses into alveoli ( having low pCO2) . Thus, partial pressure helps in gaseous exchange.

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70% of carbondioxide is transported as ?

Bicarbonate
360 Views

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

20 - 25 times
414 Views

Name the cavity having lungs.

Thoracic cavity.
448 Views

Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
415 Views

What is the partial pressure of oxygen in  oxygenated blood ?

95 mm Hg
702 Views