Ncert Exercises & Solutions

A person suffers punctures in his chest cavity in an accident, without any damage to the lungs, its effect could be

1.	reduced breathing rate	2.	rapid increase in breathing rate
3.	no change in respiration	4.	cessation of breathing

(d) The movement of air into and out of the lungs is carried out by creating a pressure gradient between the lungs and the atmosphere. The pressure within the lungs is less than the atmospheric pressure so there is a negative pressure in the lungs with respect to atmospheric pressure.

The puncture in the chestaffects this pressure gradient maintained by the lungs and thus may cause cessation of breathing.

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