Provisional Authority

A provisional organ is a temporarily existing organ that performs a vital function for the development of the body. A provisional body can be either temporary or permanent.

One example of a provisional organ is the primary kidney in the embryo. It performs the function of excreting urine, which is necessary to remove metabolic products from the body. After the birth of a child, the primary kidney disappears, and in its place a more complex organ, the ureter, is formed.

Another example of a provisional function is the yolk sac. It is formed in the embryo after the formation of the primary intestine and performs the function of nutrition. After development is complete, the yolk sac disappears and the liver forms in its place.

The provisional organ plays an important role in the development of the body, providing it with necessary functions in the early stages of life. However, after development is complete, these organs disappear, leaving room for the formation of more complex and functional organs.

The human body is a complex structure in which all organs perform their functions. However, some organs must perform important tasks temporarily until others are ready to fully function. This body is called provisional.

A provisional organ is a temporary organ that performs a vital function for the development of the organism, but which disappears when another organ achieves full functionality. Thus, provisional organs play an important role during pregnancy and fetal development.

One of the most well-known functions of the provisional organs is the primary (embryonic) kidney, which is necessary to maintain the functioning of the urinary tract and kidneys in mammals. The cells that form the kidneys begin to develop around the 3rd week of embryonic development. At the 9th week, the final division of the body into left and right sides occurs, and 2 kidneys remain due to the formation of the primary ureter. After this, there is a gradual decrease in the size of the primary kidney and its involution at the time of birth.

However, there are other examples of provisional authorities. Another example of a provisional organ is the placenta in a mammalian fetus. The placenta provides the fetus with access to maternal hormones and nutrients, and also protects the fetus from harmful substances. It begins to form in the fourth week of pregnancy after trophoblast divisions. It reaches its maximum mass by 28-29 weeks and disappears after 38 weeks.

Despite the fact that provisional organs are organs that are temporarily necessary for the development of the organism and disappear after its completion, they