(C) The heart of a cockroach $(Periplaneta \ americana)$ is an elongated,tubular structure located along the mid-dorsal line of the thorax and abdomen

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(C) The heart of a cockroach $(Periplaneta \ americana)$ is an elongated,tubular structure located along the mid-dorsal line of the thorax and abdomen. It consists of $13$ funnel-shaped chambers with ostia on either side. Therefore,the correct description is that it is elongated and tubular.