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Why inspiration of cockroach is said to ...

Why inspiration of cockroach is said to be a passive process while it is an active process in man?

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1. In man inspiration (inhalation of oxygen) is brought about by contraction of intercostal muscles and diaphragm with expenditure of energy. Thus it is said to be an active process.
2. In cockroach the oxygen enters through openings along the body and disappears into the fluid to be circulated throughout the body. The energy required is less since the process is more of a diffusion.
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