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Which of the following is correct w.r.t....

Which of the following is correct w.r.t. the respiration in cockroach?

A

Tergo-sternal muscles contract and relax harmoniously to cause expiration and inspiration respectively

B

Tracheolar fluid is withdrawn inside the tracheoles when oxygen requirement increases during activity.

C

Expiration is passive as it occurs due to relaxation of muscles.

D

Inspiration is active as it occurs due to contraction of muscles

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