Question

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 axis

I 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 1

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.