What term describes the external openings through which insects exchange air?

What term describes the external openings through which insects exchange air?

• A. Spiracles
• B. Gills
• C. Tracheae
• D. Mouthparts

Answer: (A)

Spiracles are the external openings through which insects exchange air. Insects breathe with a tracheal system: air enters the body through these openings, travels down a branching network of tracheae to reach individual cells, and can be opened or closed to help regulate water loss. Gills are used by aquatic organisms to extract oxygen from water, not the typical mechanism in terrestrial insects. Tracheae are the internal tubes that carry air once it has entered, not the openings themselves. Mouthparts are for feeding and do not serve as entry points for air.

Spiracles are the external openings through which insects exchange air. Insects breathe with a tracheal system: air enters the body through these openings, travels down a branching network of tracheae to reach individual cells, and can be opened or closed to help regulate water loss. Gills are used by aquatic organisms to extract oxygen from water, not the typical mechanism in terrestrial insects. Tracheae are the internal tubes that carry air once it has entered, not the openings themselves. Mouthparts are for feeding and do not serve as entry points for air.