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 farce of the cockroachs heart.
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