The shell is porous and the large end contains more pores than the small end of the egg. The fertilized egg then moves to the uterus, where it implants to the uterine lining. Structure of the Egg. The air cell grows larger as an egg ages. The Parts of the Egg Looking at the egg from the outside we see the shell, which is a hard, protective covering composed primarily of calcium carbonate. Fertilization of an egg by a sperm normally occurs in the fallopian tubes. ALBUMEN: The egg white is known as the albumen, which comes from albus, the Latin word for “white.” Four alternating layers of thick and thin albumen contain approximately 40 different proteins, the main components of the egg white in addition to water. These are called as the ova or oocytes. The egg is also one of the most nutritious and versatile of human foods. In high-quality eggs, the inner thick albumen stands higher and spreads less than thin white. Ovulation - The releasing of the egg yolk from the ovary to begin its journey through the oviduct. It produces the female egg cells necessary for reproduction, called the ova or oocytes. They prevent the yolk from rising and touching the shell. The egg is a biological structure intended by nature for reproduction. The chalazae function to suspend the egg yolk in the center of the egg. The female reproductive system consists of both internal and external parts. Their job is to prevent the liquid that is inside the egg from evaporating, as well as keep the egg protected from bacteria. The female reproductive system is designed to carry out several functions. 6. In the long axis of the egg, the chalaziferous layer is twisted at both sides of the yolk, forming a thick rope-like structure named the chalazae (chalaza is the singular term). Vent - the exterior opening through which passage occurs from the digestive system, the urinary tract and the reproductive tract. This part of the egg is a excellent source of riboflavin and protein. Vitelline membrane -- The clear casing that encloses the egg yolk. The primary function of the female reproductive system is to produce the female egg cells which are essential for reproduction. (There are about 7,000 pores in a chicken eggshell.) Learn more about the health benefits of eggs, some ideas for preparing them, possible health risks, and vegan alternatives. 4. It is important to know that, the entire system is designed for transporting the ova to the exact fertilization site. 5. 7. egg passes is also responsible for the expulsion of feces and urine. In low-quality eggs, it appears thin white. The membranes are clear and soft but have a definite egg-like shape. Fallopian tubes: These are narrow tubes that are attached to the upper part of the uterus and serve as pathways for the ova (egg cells) to travel from the ovaries to the uterus. 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