A) heart and circulation
B) Malpighian tubules and excretion
C) trachea and respiration
D) none of the above
Correct Answer: A
Solution :
Alary muscles are a pair of triangular fan 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 cockroachs heart. Malpighian tubules are excretory organs of cockroach; air tubes or tracheae helps in respiration in cockroach.
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