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Contraction in diaphgram causes increase in thoracic volume in the _____(a) dorso-ventral axis(b) antero-posterior axis(c) dorso-posterior axis(d) antero-ventral axisI have been asked this question in a job interview.Asked question is from Mechanism of Breathing-2 topic in chapter Breathing and Exchange of Gases of Biology – Class 11

Answer»

Right option is (b) antero-posterior axis

The best I can explain: At the time of inspiration diaphgram contracts leading to increase in THORACIC VOLUME in the anterior posterior axis. Whereas MOVEMENT of sternum causes INCREMENT in antero-ventral DIRECTION.



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