A) Heart & circulation
B) Malpighian tubules & excretion
C) Trachea & respiration
D) None of these
Correct Answer: A
Solution :
Alary muscles are a pair of triangular, an like muscles in the floor of pericardial sinus of cockroach. The respiratory movements of abdomen and contraction of alary muscles increase the pumping force of the cockroach?s heart,
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