What is the last step involved in respiration | vedclass

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(C) The process of respiration involves the following sequential steps:$(1)$ Breathing or pulmonary ventilation by which atmospheric air is drawn in a

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Utilisation of $O_2$ by body cells and resultant release of $CO_2$

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(C) The process of respiration involves the following sequential steps:$(1)$ Breathing or pulmonary ventilation by which atmospheric air is drawn in and $CO_2$ rich alveolar air is released out.$(2)$ Diffusion of gases ($O_2$ and $CO_2$) across alveolar membrane.$(3)$ Transport of gases by the blood.$(4)$ Diffusion of $O_2$ and $CO_2$ between blood and tissues.$(5)$ Utilisation of $O_2$ by the cells for catabolic reactions and resultant release of $CO_2$ (cellular respiration).Therefore,the last step is the utilisation of $O_2$ by body cells.

Column-$I$	Column-$II$ ($mm\, Hg$ pressure)
$P$. Atmospheric air	$I$. $40$
$Q$. Tissues	$II$. $45$
$R$. Oxygenated blood	$III$. $0.3$

What is the last step involved in respiration?

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Match the partial pressure of carbon dioxide in different parts involved in diffusion in comparison to the atmosphere.
Column-$I$ Column-$II$ ($mm\, Hg$ pressure)
$P$. Atmospheric air $I$. $40$
$Q$. Tissues $II$. $45$
$R$. Oxygenated blood $III$. $0.3$

The respiration rate is lowest while

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