Breathing cycle is an essential process for the exchange of gases’. Justify this statement.
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The breathing cycle involves inhalation and exhalation of air due to alternate expansion and contraction of thoracic cavity. Thus it is a rhythmic process. But exchange of gases is a continuous process as it takes place between the blood and each and every cell, by diffusion. Imagine a situation when we stop breathing, that is there will be no intake of oxygen and no release out of $CO _2$. In that situation, oxygen supply will be stopped in our body and there will be continuous accumulation of $CO _2$ inside the body. This can be fatal and the person may die because of suffocation. That is why it is said that breathing cycle is an essential process for the exchange of gases.
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