meaning of spiracles
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an external respiratory opening, especially each of a number of pores on the body of an insect, or each of a pair of vestigial gill slits behind the eye of a cartilaginous fish.
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Spiracles are small openings on the surface of some animals including insects and fishes which help in exchange of gases and lead to the respiratory systems.
Insects have spiracles on their body surface which are guarded by muscles for their opening and closing and controlled by central nervous system but also react to external stimuli. The spiracles lead to the trachea which directly gives oxygen to the tissues of the animal.
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