The abdomen holds the insect's most important inside organs. You have an abdomen. It holds your stomach and intestines. An insect's abdomen holds its stomach and intestines, too. But it has even more.
Insects have their hearts in their abdomen.
You keep yours in your chest. The abdomen is that part that sticks out behind the legs. You breathe through your mouth and lungs. Insects breathe through their abdomen. Insects have lots of little holes on their abdomen called spiracles .