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Q: An embryonic structure that functions both as a respiratory membrane and as a site for the storage of nitrogenous wastes is the 1. amnion 2. yolk sac 3. allantois 4. chorion?
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What is an allantoid?

An allantoid is another name for an allantois - a sac, with a number of functions, which develops in the alimentary canal of the embryos of mammals, birds, and reptiles.


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What are the 3 functions of the respiratory?

The system of organs involved in the acquisition of oxygen and the elimination of carbon dioxide by an organism. The lungs and gills are the two most important structures of vertebrates involved in the phase known asexternaml respiratory, orhttp://www.answers.com/topic/gaseous exchanges, between the blood and environment. Internal respiration refers to the gaseous exchanges which occur between the blood and cells. Certain other structures in some species of vertebrates serve as respiratory organs; among these are thehttp://www.answers.com/topic/integument or skin of fishes and http://www.answers.com/topic/amphibian. The http://www.answers.com/topic/moist, highly http://www.answers.com/topic/vascular skin of anuran amphibians is important in respiration. Certain species of fish have a vascular http://www.answers.com/topic/rectum which is utilized as a respiratory structure, water being taken in and ejected regularly by the animal. Saclike cloacal structures occur in some aquatic species of turtles. These are vascular and are intermittently filled with, and emptied of, water. It is thought that they may function in respiration. During embryonic life the http://www.answers.com/topic/yolk-sac and http://www.answers.com/topic/allantois are important respiratory organs in certain vertebrates. See also http://www.answers.com/topic/allantois;yolk-sac.


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