Which of the following statement(s) is (are) | vedclass

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(B) Statement $(i)$ is false because during inhalation,the ribs move outward and the diaphragm moves downward (flattens) to increase the thoracic cavi

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$(ii)$ and $(iv)$

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(B) Statement $(i)$ is false because during inhalation,the ribs move outward and the diaphragm moves downward (flattens) to increase the thoracic cavity volume.Statement $(ii)$ is true because alveoli are the sites of gaseous exchange where oxygen diffuses into the blood and carbon dioxide diffuses out.Statement $(iii)$ is false because haemoglobin has a much higher affinity for oxygen than for carbon dioxide.Statement $(iv)$ is true because the millions of alveoli in the lungs significantly increase the surface area available for the exchange of gases.Therefore,statements $(ii)$ and $(iv)$ are correct.

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