What are spiracles?

Spiracles are specialized openings that serve as valves for the respiratory system in certain organisms, particularly in insects and some arthropods. They are strategically located on the body and open and close to regulate airflow into the tracheal system, which is responsible for gas exchange. By opening or closing these spiracles, organisms can control oxygen intake and carbon dioxide release, which is crucial for their survival.

Insects rely on this mechanism because they do not have lungs like mammals. Instead, they transport oxygen directly to their tissues through a network of tubes known as tracheae, which connects to the outside environment via these spiracles. This adaptation allows them to efficiently meet their respiratory needs while minimizing water loss, which is vital for their survival in various environments.