The heart of a cockroach is........

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(B) The heart of a cockroach is an elongated,tubular structure located along the mid-dorsal line of the thorax and abdomen.It consists of $13$ funnel-

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Having ostia

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(B) The heart of a cockroach is an elongated,tubular structure located along the mid-dorsal line of the thorax and abdomen.It consists of $13$ funnel-shaped chambers.Each chamber has a pair of lateral openings called $ostia$ on either side,which allow blood (hemolymph) to enter the heart from the body cavity (sinuses) but prevent it from flowing back out.Therefore,the correct characteristic is that it has $ostia$.

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