## 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

State the volume of air remaining in lungs after a normal breathing.

The volume of air remaining in the lungs after a normal expiration is known as functional residual capacity (FRC).
It includes expiratory reserve volume (ERV) and residual volume (RV). It is calculated by the formula -: FRC = ERV + RV.

Where

ERV is the maximum volume of air that can be exhaled after a normal expiration. It is about 1000 mL to 1100 mL.

RV is the volume of air remaining in the lungs after maximum expiration. It is about 1100 mL to 1200 mL.

Thus

FRC = ERV + RV
FRC = 1100 + 1200
FRC =  2300 mL

Functional residual capacity of the human lungs is about 2.1 - 2.3 L.

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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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70% of carbondioxide is transported as ?

Bicarbonate
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Oxygen is carried by haemoglobin as?

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

95 mm Hg
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Name the cavity having lungs.

Thoracic cavity.
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