EVERYDAY SCIENCE

Detailed explanation-1: -Aquatic arthropods (crustaceans and the chelicerate horseshoe crabs) possess gills for respiration. Although they vary in structure and location, the gills are always outgrowths of the integument (skin) and are therefore covered by the exoskeleton, which is thin in this area and not a barrier to the exchange of gases.

Detailed explanation-2: -Because the exoskeleton is impermeable respiratory gases must move into the insect through a series of internal tubes called tracheae or tracheal tubes. These tracheae are highly branched helping to increase the Surface area : volume ratio available for gas exchange.

Detailed explanation-3: -Gas exchange in insects occurs primarily through an elaborate air-filled tubular respiratory system: the tracheal system. Tracheae are invaginations of cuticular cells that assemble into branching tubes (tracheae) leading from valved holes in the exoskeleton (termed spiracles).

Detailed explanation-4: -In fishes it takes place through gills and in insects through the tracheae.

Detailed explanation-5: -Most arthropods that live in the water have gills. Arthropods that live on land have a series of tubes throughout their body called a tracheae.