The main provisions of the cellular theory postulates of the unity of all life

The Main provisions of the cell theory are the basis for the understanding of the laws of the origin and existence of living organisms consisting of elementary structural units. It's a biological generalization proves that life exists only in the cage, and that each "live cell” is a system, able to exist.

The Main provisions of the cell theory was formulated by M. Schleiden and T. Sannam and supplemented by R. Verhoven. Before you make inferences and to formulate the postulates of this theory, experts have studied the works of many of his predecessors. So, in 1665 R. Hooke for the first time on the tube saw education called “cage”. Then we described the cellular structure of many plants. Later A. Leeuwenhoek described unicellular. In the NINETEENTH century to improve the construction of the microscope leads to the expansion of notions about the structure of organisms, the concept of living tissues. T. Schwann comparative analysis of the smallest structural units of flora and fauna, and Schleiden published a book «Materials patogeneza”.

The Main provisions of the cell theory developed by Schleiden and Sannom:

1. All the flora and fauna are composed of elementary structural units.
2. Growth and development of plant and animal body take place due to the emergence of a new “living cells”.

This structure is the smallest unit of the living, and the body – this is their collection.

Then R. Virchow added a very important point that every structural unit derived from his own kind. This work was edited and summarized many times. Now the main points of modern cell theory are as follows:

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1. The Cell represents the basic unit of living things.
2. The Smallest structural unit of all living things homologous composition, life processes and metabolism.
3. Multiply the cell division of the parent.
4. All basic units of living things have the same beginning, i.e., they are totipotent.
5. In multicellular organisms smallest living things are interconnected according to the functions performed, forming a more complex structure (tissue, organ and organ system).
6. Each “live cell” is an open system that is able to regulate the process of renewal, reproduction and maintain homeostasis.

In recent years (after many scientific discoveries) extend this theory by adding new information. However, it is not completely systematic, so it postulates some are treated quite arbitrarily. Consider the most common additional provisions of the cell theory:

1. The Smallest structural unit types of cell and nuclear organisms are not fully their composition and structure are identical to each other.
2. The Continuous transmission of genetic information also applies to some organelles (chloroplasts, mitochondria, chromosomes, genes) «living cells”.
3. The Basic unit of the living though totipotent, however, the work of their genes are different. That is what leads to their differentiation.
4. Multicellular organisms are a complex system whose operation is carried out by chemical factors, humoral and neural regulation.

Thus, the main provisions of the cell theory are generally accepted biological generalization, which proves the unity of the principle of structure, existence and development of all living beings, having a cellular structure.