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Oogenesis
- oogenesis, in the human female reproductive system, growth process in which the primary egg cell (or ovum) becomes a mature ovum.
www.britannica.com/science/oogenesis
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What is oogenesis in the human reproductive system?
At the time of hatching, the female chick has up to 4000 tiny ova (reproductive cells), from some of which full-sized yolks may develop when the hen matures. Each yolk (ovum) is enclosed in a thin-walled sac, or follicle, attached to the ovary. This sac is richly supplied with blood.
- Cuticle
- Eggshell
- Shell Membrane
- Air Cell
- Albumen
- Chalaza
- Yolk
It is thin, invisible and transparent membrane which covers the whole egg. It has two functions such as prevention of microbial penetration in the egg and sealing the eggshell pore to minimize the moisture loss from the egg internal content. There are some controversies about the mechanism of antimicrobial properties of cuticle. Most of the researc...
The natural outer hard covering of an egg is eggshell, and it works as protective covering for the internal content of egg (Fig. 2.2). It consists of crystalline CaCO3 and constitutes about 8.5–10.5% of total egg weight . Colour of the eggshell of chicken is white or brown. Especially protoporphyrin IX is responsible for brown colouration of chick...
After the eggshell there are two thin membranes: outer and inner shell membrane which helps to prevent microbial invasion into egg, and it constitutes about 0.4% of total egg weight. Between these two shell membranes, the outer one is slightly thicker than the inner one. The membranes adhere to each other in the entire area of egg except the blunt ...
It is a small dilatation in the blunt end of egg. When an egg is formed in the female genital system of hen, it gets the heat due to the body temperature of hen (41 °C) and no air cell is observed in initial state in the egg. But when an egg is laid by a mother bird, it comes in the environment where the ambient temperature is lower than the body t...
It is the white edible part of an egg. It constitutes about 53.8% of total egg weight . There are four different layers of albumen such as outer loose, outer thick, inner loose and inner thick albumen. Ovamucin is responsible for sticky character of albumen . Albumen contains ovotransferrin, ovomucoid, lysozyme, ovoinhibitor, avidin and cystatin an...
On each side of yolk there are two whitish cords like structure which starts from the outer thick albumen and enters into the yolk. It helps to keep the yolk in central position of an egg.
The yellowish colour round, ball-shaped structure at the centre of egg is called yolk. It constitutes 32.8% of total egg weight . It is the main source of nutrients for developing embryo and acts as an energy reservoir . A transparent membrane which covers the whole yolk and keeps the yolk compact is a vitelline membrane. It consists of two layers:...
Oogenesis. The process of producing eggs in the ovary is called oogenesis. Eggs, like sperm, are haploid cells, and their production occurs in several steps that involve different types of cells, as shown in Figure below. You can follow the process of oogenesis in the figure as you read about it below. Oogenesis.
Oogenesis, in the human female reproductive system, growth process in which the primary egg cell (or ovum) becomes a mature ovum. In any one human generation, the egg’s development starts before the female that carries it is even born; 8 to 20 weeks after the fetus has started to grow, cells that.
- The Editors of Encyclopaedia Britannica
Fertilization, formation of the vitelline membrane and of the first layer of albumen of the egg takes place in the infundibulum. The majority of albumen is produced during the passage through the magnum and subsequently egg shell membranes are formed in the isthmus.
Mar 1, 2013 · During the hatch, hormone systems act as critical endogenous effectors that transmit environmental information to the cells, resulting in regulation of gene expression, metabolism, and behavior (McNabb, 2007).
Oogenesis is the process by which mature female gametes, or ova, develop from germ cells. The image below summarizes how this happens, and over what timeline it unfolds. What are 'n' and '2n'? Why are polar bodies so small? As the oocytes develop, they get enclosed in structures known as follicles.
