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Breathing and Exchange of Gases

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12

Define oxygen dissociation curve. Can you suggest any reason for its sigmoidal pattern ?

Oxygen dissociation curve is the sigmoid curve obtained when the percentage saturation of haemoglobin with O2 is plotted against the partial pressure of oxygen pO2.  It helps in the study of the effect of factors like pCO2, H+ concentration etc. on binding of oxygen with haemoglobin.

The binding of oxygen to haemoglobin is in such a way that the binding of the first oxygen oxygen molecule binds to the haemoglobin, it increases the affinity for the second molecule of oxygen to bind. Subsequently, haemoglobin attracts more oxygen and this gives the curve a sigmoid shape.

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70% of carbondioxide is transported as ?

Bicarbonate
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Name the cavity having lungs.

Thoracic cavity.
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Oxygen is carried by haemoglobin as?

Oxyhaemoglobin.
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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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What is the partial pressure of oxygen in  oxygenated blood ?

95 mm Hg
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