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Breathing and Exchange of Gases

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Biology

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
 Diffusion of gases occur in the alveolar region only and not in the other part of respiratory system, why ?

Alveoli have thin walls, have layer of mucus on inner side and have rich supply of blood. Each alveolus is made up of highly-permeable and thin layers. The barrier between the alveoli and the capillaries is thin and the diffusion of gases takes place from higher partial pressure to lower partial pressure. The pO2 of blood is lesser than alveolar air and pCO2 of blood is greater than alveolar air. Thus, alveoli support the diffusion of gase.  
Since the other region do not provide the necessary conditions like thin and permeable membrane, difference in the partial pressure of the gases across the membrane etc., they do not supprt the diffusion of gases as alveoli. 

 

245 Views

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

20 - 25 times
414 Views

70% of carbondioxide is transported as ?

Bicarbonate
360 Views

What is the partial pressure of oxygen in  oxygenated blood ?

95 mm Hg
702 Views

Name the cavity having lungs.

Thoracic cavity.
448 Views

Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
415 Views