What are spiracles used for in insects?

Spiracles are small openings found on the surface of insects and are primarily involved in respiration. These structures are part of the insect’s tracheal system, which is how insects breathe. When an insect opens its spiracles, air flows into the tracheae, which are a series of tubes that deliver oxygen directly to the tissues, while also removing carbon dioxide from the body. This method of gas exchange is highly efficient for insects and is essential for their survival.

Digestive functions, reproduction, and movement are not associated with spiracles. The digestive system in insects is a separate structure involving different anatomical features, reproduction involves different organs such as the reproductive system, and movement is facilitated by the muscular structures and limbs. Hence, spiracles specifically serve the respiratory function in insects, making it a critical adaptation for life in various environments.