definition of spiracles
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Explanation:
These are the body parts in various species which helps in breathing. So the respiratory system of their body works with the help of Spiracles. These are the breathing openings found on the surface of insects. Certain cartilaginous fish and certain species of sharks etc. don’t have spiracles.
In fish, these comprise a pair of openings just behind their eyes. These allow it to draw oxygenated water in from above without having to bring it in through the gills. In this article, we will learn about Spiracles and their types and examples.
spiracles
Definition of Spiracles
Usually, some animals have openings on the surface of their skin, which usually lead to respiratory systems. Insects sometimes have it on their exoskeletons to allow air to enter the trachea. We can locate them laterally along the thorax and abdomen of most insects – usually one pair of spiracles per body segment.
Small muscles that operate one or two flap-like valves within each spiracle – contracting to close the spiracle, or relaxing to open it, regulate the airflow.
The timing and duration of spiracle closures affect the respiratory rates of the organism. These sometimes may also be surrounded by the hair to minimize bulk air movement around the opening, and thus minimize water loss. In some fish, it exists as a small opening behind both eyes that leads to the mouth.
These open into the mouth of fish, where water is passed over its gills for gas exchange and out of the body. Moreover, it assists fishes in respiration even when they are lying on the ocean bottom or when they’re inside in the sand.