The phenomenon of normal breathing in a human being comprises of

An active inspiratory and a passive expiratory phase.

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A passive inspiratory and an inactive expiratory phase.

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Both active inspiratory and expiratory phases.

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Both passive inspiratory and expiratory phases.

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Solution

The correct option is B An active inspiratory and a passive expiratory phase.
The phenomenon of normal breathing in a human being comprises of an active inspiratory and a passive expiratory phase. During inspiration, muscles of ribs and diaphragm contracts. Hence, it is an active process. During expiration, muscles of ribs and diaphragm relax. Hence, it is a passive process.
Thus, the correct answer is option A.

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Similar questions

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The inspiratory and expiratory centres are present in the___(i)____. The Pneumotaxic and the Apneusticcentres are present in the___(ii)___. The inspiratory system is basically responsible for___(iii).___ The expiratory system become activated during forced ___(iv)___.

Q. Distinguish between inspiratory capacity and expiratory capacity.

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The inspiratory and expiratory centres are present in the___(i)____. The Pneumotaxic and the Apneustic centres are present in the___(ii)___. The inspiratory system is basically responsible for___(iii).___ The expiratory system become activated during forced ___(iv)___.

Q. Assertion :If two men, expire the same volume of air after normal inspiration, they have the same expiratory capacity. Reason: Expiratory capacity includes tidal volume and inspiratory reserve volume.

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