Most insects have a dorsal tube that is divided into different chambers. This is what serves as the heart in an insect. The dorsal tube is located toward the thorax which is in the midsection of the insect.
abdomen
Depends on the insect.
Its head.
Insects have body parts just like humans do. The thorax of an insect is like the chest. On the thorax are the insect's head, legs, wings, leading to its abdomen. The abdomen is the stomach, and it also contains the insect's genitals (like humans, insects can be male or female).
The body cavity that contains the stomach is the abdominal cavity.
The stomach, I believe contains hydrochloric acid. HCl.
The Digestive System
Abdominal cavity
Heart, stomach, liver
The stomach is sadly not the most important organ in the body, the HEART is. The heart pumps blood round your body and without it, you would be pretty useless!! hope this helps you =)
The gastrointestinal system (GI system) contains the stomach.
stomach
The function of the insects circulatory system is the transportation of food, but not oxygen through the body. insect blood is green, not red like mammal blood. The insect heart is a simple tube running along their backs.