1. A cockroach has small openings on the sides of its body.
2. Other insects have similar openings.
3. On the underside of the cockroach in each segment, there are small holes which are connected through respiratory tubes in a network.
4. These help the cockroach to breathe. These holes are called spiracles.
5. The network of respiratory tubes called trachea take air from these spiracles, circulate it throughout the body, collect it back and send it out through these spiracles.
6. To know more about this process you may observe a live cockroach by keeping it covered by a transparent bottle or glass.
