respiratory gases

For What Purpose Are Spiracles Used?

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For What Purpose Are Spiracles Used? In elasmobranch and ganoid fishes a pair of spiracles, derived from the gills, is used as a water passageway during respiration. The nasal opening of whales and other cetaceans is called a spiracle, as is the respiratory opening behind the eyes of rays and skates. Which animals use spiracles?

Do Flatworms Have Respiratory System?

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Do Flatworms Have Respiratory System? Do flatworms have respiratory system? Flatworms have no specialized respiratory system; gases simply diffuse across the body wall. Why dont flatworms have a respiratory system? There is no need for a special circulatory system as a human has because the flatworm doesn’t breathe with lungs and doesn’t need to transport