(ORDO NEWS) — For metabolism and development, the embryo in the egg, like an adult bird (or reptile), needs to inhale oxygen and remove the metabolic product – carbon dioxide.
The embryo of a mammal (for example, a human) develops inside the mother’s body and receives oxygen through the circulatory system common with the mother. In the same way, through the blood, the fetus removes carbon dioxide, which enters the lungs of the mother and exhales.
The egg, however, does not have a separate structure and blood circulation with the brood hen. How does a chicken breathe?
It’s all about the air bag between the two membranes under the shell – the outer and the inner. The bag is formed when the newly laid egg cools down, the protein with the yolk decreases in size and a cavity appears under the shell.
Through the pores in the shell, air is drawn in from the outside. There are about 7000 pores and it is through them that gas is exchanged between the bag inside the egg and the atmosphere. Warm carbon dioxide comes out, cold air with oxygen is sucked in.
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