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  2. Gill - Wikipedia

    en.wikipedia.org/wiki/Gill

    The gills are composed of comb-like filaments, the gill lamellae, which help increase their surface area for oxygen exchange. [5] When a fish breathes, it draws in a mouthful of water at regular intervals. Then it draws the sides of its throat together, forcing the water through the gill openings, so it passes over the gills to the outside.

  3. Fish gill - Wikipedia

    en.wikipedia.org/wiki/Fish_gill

    The gill arches of bony fish typically have no septum, so that the gills alone project from the arch, supported by individual gill rays. Some species retain gill rakers . Though all but the most primitive bony fish lack a spiracle, the pseudobranch associated with it often remains, being located at the base of the operculum.

  4. Lamella (surface anatomy) - Wikipedia

    en.wikipedia.org/wiki/Lamella_(surface_anatomy)

    In fish, gill lamellae are used to increase the surface area in contact with the environment to maximize gas exchange (both to attain oxygen and to expel carbon dioxide) between the water and the blood. [3] In fish gills, there are two types of lamellae, primary and secondary. The primary gill lamellae (also called gill filament) extends from ...

  5. External gills - Wikipedia

    en.wikipedia.org/wiki/External_gills

    External gills are the gills of an animal, most typically an amphibian, that are exposed to the environment, rather than set inside the pharynx and covered by gill slits, as they are in most fishes. Instead, the respiratory organs are set on a frill of stalks protruding from the sides of an animal's head. The axolotl has three pairs of external ...

  6. Fish physiology - Wikipedia

    en.wikipedia.org/wiki/Fish_physiology

    The gill arches of bony fish typically have no septum, so that the gills alone project from the arch, supported by individual gill rays. Some species retain gill rakers. Though all but the most primitive bony fish lack a spiracle, the pseudobranch associated with it often remains, being located at the base of the operculum.

  7. Lamella (mycology) - Wikipedia

    en.wikipedia.org/wiki/Lamella_(mycology)

    The attachment of the gills to the stem is classified based on the shape of the gills when viewed from the side, while color, crowding and the shape of individual gills can also be important features. Additionally, gills can have distinctive microscopic or macroscopic features. For instance, Lactarius species typically seep latex from their gills.

  8. Gill slit - Wikipedia

    en.wikipedia.org/wiki/Gill_slit

    Gill slits are individual openings to gills, i.e., multiple gill arches, which lack a single outer cover. Such gills are characteristic of cartilaginous fish such as sharks and rays, as well as deep-branching vertebrates such as lampreys. In contrast, bony fishes have a single outer bony gill covering called an operculum.

  9. Chiton - Wikipedia

    en.wikipedia.org/wiki/Chiton

    The underside of the gumboot chiton, Cryptochiton stelleri, showing the foot in the center, surrounded by the gills and mantle: The mouth is visible to the left in this image. The mouth is located on the underside of the animal, and contains a tongue-like structure called a radula , which has numerous rows of 17 teeth each.