Mia Patel
How does a chick breathe inside its shell? It's a cracking good question. All animals need oxygen to survive, so how does a chick get oxygen while sealed inside an egg? The answer lies in some nifty engineering inside the eggshell. A fertilised egg has a membrane called the allantois, which is a hollow, sac-like structure that grows from the chick's gut. This fuses with a second membrane, the chorion, which surrounds the chick and its yolk. Together, they form the chorioallantoic membrane, which acts like lung tissue. Oxygen diffuses through microscopic pores in the shell to the blood vessels in the chorioallantoic membrane, and then on to the chick's bloodstream. Carbon dioxide, the gaseous waste product of respiration, passes out through the pores in the opposite direction.
| Characteristics | Values |
|---|---|
| Number of pores in a chicken egg shell | More than 7,000 |
| Function of pores | Allow carbon dioxide to escape and fresh air to enter the egg |
| Air cell | Also called an air sack, it is filled with oxygen and lies between the two membranes under the shell |
| Membranes | Two membranes lie directly under the shell |
| Allantois | A membranous bag attached to the chick's gut and the inner surface of the egg shell, it aids in oxygen absorption |
| Chorioallantoic membrane | A fused membrane with a network of blood vessels that facilitates gas exchange |
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What You'll Learn
Oxygen enters through pores in the eggshell
All animals require oxygen to survive. When animals, including humans, breathe in, oxygen enters the lungs and is then distributed to all the different parts of the body. The oxygen is used in an internal chemical reaction called metabolism to provide the animal with energy. The process of metabolism also produces a waste gas called carbon dioxide. To get rid of it, the carbon dioxide is carried back to the lungs, where it is collected and exhaled.
Animals that grow inside their mothers, like humans, get their oxygen from their mothers. The bloodstreams of the baby animal and the mother are connected through an umbilical cord, which allows the baby to collect oxygen that the mother breathes in and use the mother's lungs to get rid of the carbon dioxide.
However, animals that develop inside an egg outside of their mothers' bodies, such as chickens, do not have umbilical cords. Bird and reptile eggs have a hard shell. Directly under the shell are two membranes. When the eggs are laid by the mother, they are warmer than the air, and as they cool, the material inside the egg shrinks a little bit. This shrinkage pulls the two membranes apart, leaving behind a small air cell, also called an air sack, filled with oxygen. As the animal develops, it uses the oxygen from the air sack and replaces it with carbon dioxide.
The tiny pores in the shell allow the carbon dioxide to escape and fresh oxygen to get in. A chicken egg shell has more than 7,000 pores. These pores also allow water to go through the shell, which is why the dye appears as small dots on the inside of the shell, often clustered in certain areas, and why an egg after being hard-boiled would weigh slightly more than when it was raw.
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The allantois, a sac-like structure, aids oxygen absorption
The allantois is a sac-like structure that plays a crucial role in aiding oxygen absorption in a chick inside its shell. It is one of the extraembryonic membranes that develop in birds during embryonic development, along with the yolk sac, amnion, and chorion. These membranes provide essential functions such as protection, nutrition, respiration, and excretion to support the developing embryo.
The allantois, derived from the Greek word "allantois" meaning "sausage-shaped", is a membranous bag attached to the chick's gut at one end, while the other end lies close to the inner surface of the egg shell. It is an elongated pouch that grows out of the bottom of the developing chick embryo. Unlike in mammals, where the allantois becomes the umbilical cord, in birds, the allantois protrudes out and fuses with another membrane, the chorion, forming the chorioallantoic membrane.
The chorioallantoic membrane has a network of blood vessels within it, and it lies against the inner surface of the porous eggshell. This membrane plays a vital role in gas exchange, allowing oxygen to diffuse through the eggshell and into the blood while carbon dioxide moves in the opposite direction. The pumping action of the chick's heart ensures blood circulation through the allantois and the chorioallantoic membrane, facilitating this gas exchange process.
In addition to aiding oxygen absorption, the allantois also assists in waste removal. The hollow interior of the allantois serves as a storage space for nitrogen-containing waste products, ensuring the developing chick can expel these wastes effectively. This dual function of the allantois in respiration and waste removal is crucial for the survival and healthy development of the chick embryo inside its shell.
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Blood vessels in the chorioallantoic membrane transport oxygen
The chorioallantoic membrane (CAM) is a highly vascularized membrane found in the eggs of certain amniotes, such as birds and reptiles. It is formed by the fusion of the mesodermal layers of two extra-embryonic membranes—the chorion and the allantois. The CAM is the outermost extra-embryonic membrane, lining the non-vascular egg shell membrane.
The CAM has a rich vascular system that develops within the mesodermal layer and is served by paired allantoic (umbilical) arteries and veins. The blood vessels in the CAM enable it to act as a gas exchange organ, facilitating the intake of oxygen and the elimination of carbon dioxide through the pores in the shell.
The density of blood vessels is greater beneath the pores in the shell compared to non-pore regions. This proximity allows for the absorption of calcium ions from the shell, which are then transported in the bloodstream to the embryo. During the first 10 days, the embryo obtains calcium from the yolk sac, but as the bones begin to ossify, calcium is primarily obtained from the shell.
The CAM is a valuable model for research in biological and biomedical fields, such as vascular development, xenograft studies, tumour growth, and toxicology. Its ease of access, rapid membrane development, and immunodeficient environment make it particularly suitable for imaging techniques and the study of angiogenesis.
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Carbon dioxide is expelled through the same process
A chicken egg has more than 7,000 pores in its shell. These pores are tiny little holes that allow carbon dioxide to escape and fresh oxygen to enter the egg. The process of metabolism produces a waste gas called carbon dioxide. As the chick grows, it uses oxygen from the air sack and replaces it with carbon dioxide. The carbon dioxide is expelled through the same pores, and fresh oxygen enters the egg through the same pores.
The pores in a chicken egg's shell allow materials to cross back and forth between the inside of the egg and the outside environment. This is how the air inside the egg is replaced by water. The pores in the shell are so tiny that they are not visible to the naked eye. To see them, one must examine a chicken egg carefully with a magnifying glass.
The number of pores in a chicken egg can vary depending on various factors such as the breed of the chicken, the age of the chicken, and the environmental conditions in which the egg is laid. However, on average, a chicken egg typically has between 7,000 and 10,000 pores.
The pores in the shell are not the only way that carbon dioxide is expelled from the egg. Some carbon dioxide is also expelled through the egg's membrane. The membrane is a thin, porous layer that covers the entire surface of the egg white and is located between the shell and the egg white. It is through these pores in the membrane that most of the carbon dioxide escapes.
The pores in the shell and the membrane work together to ensure that the developing chick has enough oxygen and that carbon dioxide is removed efficiently. This process is essential for the survival of the chick and helps to maintain the appropriate gas concentrations within the egg.
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The chick breathes inside the shell before making a hole in it
A chick breathes inside its shell before making a hole in it. This is a fascinating process, and one that scientists have studied closely. Firstly, it is important to note that all animals require oxygen to survive. When animals inhale, oxygen enters the lungs and is distributed to all parts of the body. The animal's metabolism converts the oxygen into energy, and during this process, a waste gas called carbon dioxide is produced.
Bird and reptile eggs have a hard shell. Under the shell are two membranes. When the eggs are laid, they are warmer than the air, and as they cool, the material inside the egg shrinks, pulling the two membranes apart. This creates an air cell, or air sack, filled with oxygen. As the chick develops, it uses the oxygen, which must be replenished, and it also needs to expel carbon dioxide.
The process by which this happens is through tiny pores in the shell. A chicken egg shell has more than 7,000 pores. These pores allow carbon dioxide to escape and oxygen to enter the egg. The oxygen diffuses through the eggshell, then through the walls of capillaries in the chorioallantoic membrane into the chick's bloodstream. The carbon dioxide passes out through the pores in the opposite direction.
The chorioallantoic membrane has a network of blood vessels within it. This membrane is created when the allantois, a membranous bag, fuses with the chorion, another membrane that envelopes the chick and its yolk. The allantois is attached at one end to the chick's gut, while the other end lies close to the inner surface of the egg shell.
So, the chick breathes inside the shell before it makes a hole in it, and this is made possible by the pores in the shell, and the allantois and chorioallantoic membrane within the egg.
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Frequently asked questions
A chick breathes inside its shell with the help of a membranous bag called the allantois, which is attached at one end to the chick's gut, while the other end lies close to the inner surface of the egg shell. Oxygen diffuses through microscopic pores in the shell to the blood vessels in the chorioallantoic membrane, and then on to the chick's bloodstream. Carbon dioxide passes out in the opposite direction.
A chicken egg shell has more than 7,000 pores. These pores allow carbon dioxide to escape and fresh air to get in.
Inside the shell, they break the air sac and begin to breathe, and then they make their first hole in the shell. At this stage, you can often hear them making their first peeping sounds, even before they've "zipped" (which is when they start pecking a line open around the shell).
