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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.


What type of cell functions in the repair of damaged muscle tissue?

satellite cells


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.


Compare the functions of a human embryonic membranes with those inside a bird's egg?

The human embryonic membranes, including the amnion, chorion, yolk sac, and allantois, support and protect the developing embryo in the womb by providing nourishment, gas exchange, and waste elimination. In birds, the amnion, chorion, yolk sac, and allantois inside the egg serve a similar function by enclosing the developing embryo and providing necessary nutrients, oxygen, and waste removal for growth and development. Both systems play a vital role in sustaining the developing organism until it is ready to survive independently.


What is the functions hilum?

The hilum is some type of embryonic scar on the seed that lets the seed dry out.


What are the functions of the lungs the respiratory system?

fishes are uns


What are the functions of your respiratory system?

to exchange gases in the body.


What are the primary functions of the respiratory epithelium?

The primary functions of the respiratory epithelium are to humidify and warm the air as it enters the respiratory tract, as well as to protect the underlying tissues from pathogens and foreign particles. Additionally, the respiratory epithelium is involved in the exchange of gases, such as oxygen and carbon dioxide, between the air and the blood in the lungs.


What are the four membranes in an amniotic egg.?

The amniotic egg has seven different parts that play different functions. The seven parts include the shell, albumen, chorion, yolk, allantois, ammunion and embryo.


What are the functions or the respiratory system?

The respiratory system takes in oxygen and gets rid of carbon dioxide so you can breathe.


What are the functions the respiratory system?

The respiratory system takes in oxygen and gets rid of carbon dioxide so you can breathe.


What are the functions of the respiratory system in the body?

The main function of the respiratory system is to provide the body with a constant supply of oxygen.