tracheae -- Internal tubes through which air is taken for respiration.
Tracheae open to the outside through small holes called spiracles. In the grasshopper, the first and third segments of the thorax have a spiracle on each side. Another 8 pairs of spiracles are arranged in a line on either side of the abdomen.
tracheae The small tubes that carry air from spiracles through the body cavity of an arthropod; arthropod tracheae are modifications of the exoskeleton.
trachea pl. tracheae
(trake-ee-a) [Gk. tracheia, rough]
Tiny air tubes that branch throughout the insect body for gas exchange.
tracheal system ...
Terrestrial forms have book lungs (e.g., spiders) or tracheae. (e.g., insects). Book lungs are invaginations to serve in gas exchange between air and blood. Tracheae are air tubes that serve as ways to deliver oxygen directly to cells.
Tracheae are these tubes that carry air directly to cells for gas exchange. Spiracles are openings at the body surface that lead to tracheae that branch into smaller tubes known as tracheoles.
The use of microscopes enabled him to describe the development of the chick in its egg, and discovered that insects (particularly, the silk worm) do not use lungs to breathe, but small holes in their skin called tracheae.
(Science: zoology) One of the classes of arthropoda, including those that have one pair of antennae, three pairs of mouth organs, and breathe air by means of tracheae, opening by spiracles along the sides of the body.
spiracle. An external opening of the system of ducts, or tracheae, that serves as a respiratory system in insects.
sporangium (plural: sporangia). A structure in which asexual spores are produced.
Xylem cells are also known as tracheary elements . This name was applied by Marcello Malpighi after noticing similarities between the tracheae of insects and xylem cells.
 See also: Trachea, Tissue, Organ, Plant, Long
  
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