Gill

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Gill

Gill (/ɡɪl/), in the context of biology, refers to the respiratory organ found in many aquatic organisms, which extracts dissolved oxygen from water and excretes carbon dioxide. The gills of some species, such as hermit crabs, have adapted to allow respiration on land provided they are kept moist. The microscopic structure of a gill presents a large surface area to the external environment.

Etymology

The word "gill" comes from the Old Norse word "gjǫlnar", which means gills. It is related to the Old English word "gil", which also means gill.

Related Terms

  • Respiration: The process of inhaling oxygen and exhaling carbon dioxide.
  • Aquatic Organism: An organism that lives in water.
  • Hermit Crab: A type of crab that has adapted to live on land and in water.
  • Oxygen: A chemical element that is a crucial part of the air and water, necessary for the survival of most organisms.
  • Carbon Dioxide: A chemical compound that is excreted by organisms during respiration.
  • Microscopic Structure: The structure of an object as seen under a microscope.

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