In the body cavity of a cockroach, three major organ systems are represented by the heart, the alimentary canal, and the nerve cord. Which of the following represents the correct sequence of these structures from the dorsal side to the ventral side?

Step-by-step solution

In non-chordates like the cockroach, the circulatory system is dorsal, while the nervous system is ventral. The heart of a cockroach consists of an elongated muscular tube lying along the mid-dorsal line of the thorax and abdomen. Therefore, it is the most dorsal structure among the three. The alimentary canal runs centrally through the body cavity. The nervous system consists of a double ventral nerve cord. Therefore, it is the most ventral structure. The correct sequence from dorsal to ventral is Heart Alimentary