Alary muscles of cockroach primarily help in

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excretion

circulation

locomotion

respiration

answer is B.

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Detailed Solution

Alary muscles of cockroach help in blood circulation. When alary muscles contract, the dorsal diaphragm becomes flat, and blood enters from perivisceral sinus to the pericardial sinus. When alary muscles relax, the diaphragm becomes dome-shaped, and blood enters from pericardial sinus into the heart chambers through the ostia.

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