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Which does not occur on normal inspiration?(a) Contraction in diaphragm(b) Contraction in external intercoastal muscle(c) Contraction in internal intercoastal muscle(d) Sternum moves upwardThis question was addressed to me in an online interview.This interesting question is from Mechanism of Breathing-2 in division Breathing and Exchange of Gases of Biology – Class 11

Answer»

Correct choice is (c) Contraction in internal intercoastal MUSCLE

The explanation: At the time of inspiration DIAPHGRAM and external intercoastal muscle contracts leading to increase in thoracic VOLUME. ALSO, ribs move outward and sternum moves upward.



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