Vertebrate trachea

Vertebrate trachea - Factbites
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Topic: Vertebrate trachea

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	Palaeos Vertebrates 140.860 Sarcopterygii: Osteolepiformes: Eusthenopteron
		Eusthenopteron is the gold standard for osteolepiforms, the Morganucodon of sarcopterygians, and, in fact, probably the best known Paleozoic vertebrate of any taxon, bar none.
		Note: [1] "In Eusthenopteron (a representative osteolepiform) and the tetrapods, each nasal cavity consists of a junction of three ducts (surrounded by bone) which mutually connect the external naris (homologous with the anterior naris of most fish), orbit (eye socket), and internal naris (choana, which opens into the mouth cavity en route to the trachea).
		Links: Cross-section of a Eusthenopteron- labyrinthodont tooth; Eusthenopteron エウステノプテロン; Kvastfinnefisk; Evolution of Limbs from the Fossil Record and Molecular Biology; Fall'96Syllabus; Vertebral development in the Devonian sarcopterygian fish...
	www.palaeos.com /Vertebrates/Units/140Sarcopterygii/140.860.html (1559 words)

	Aquatic insects -- Facts, Info, and Encyclopedia article
		Insects draw air into their bodies through spiracles, holes found along the sides of the (The region of the body of a vertebrate between the thorax and the pelvis) abdomen.
		Though not as complex as the gills of a fish, some aquatic insects have modified structures extending from the trachea which allow the organism to exchange gases with the environment.
		Insect hemoglobin has a strong attraction to oxygen molecules, and is carried in the hemolymph which circulates freely with the animal’s body.
	www.absoluteastronomy.com /encyclopedia/a/aq/aquatic_insects.htm (454 words)

	Lung
		Spiders have structures called "book lungs", which are not evolutionarily related to vertebrate lungs but serve a similar respiratory purpose.
		When the bird exhales, the fresh air now contained within the posterior air sac is driven into the lungs and the stale air now contained within the anterior air sacs is expelled through the trachea into the atmosphere.
		In addition to the lungs themselves, birds have posterior and anterior air sacs which are involved in controlling the air flow through the lungs.
	www.brainyencyclopedia.com /encyclopedia/l/lu/lung.html (454 words)

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Topic: Vertebrate trachea

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In the News (Fri 11 Dec 09)