A cell is life!
If you recall the course of biology, then the cell isThe structural and functional unit of any living organism. What can I say, if there are even such organisms, which represent only one cell. Hence their name is unicellular. Well, in the body of animals and human cells just an incredible variety. Let's remember the composition of the cell.
Each cell of our body is surrounded byA special protective shell, which is called "membrane." Inside it there is a core. It is worth noting that not all cells in the body contain nuclei. For example, as you mature, red blood cells lose their. In cells of striated muscles, on the contrary, there is not one nucleus, but several. As already mentioned above, the cell has a special plasma membrane. Its main function is to ensure interaction with neighboring cells and the environment. Since it is through the membrane from the cell that all the unnecessary metabolic products come out, as well as the substances necessary for normal functioning, it can be said that it is one of the most important components. The entry of substances and, conversely, their exit occurs either by the principle of diffusion, or through active transport through special channels.
In order to confirm the importance of the nucleus in lifecells, scientists have conducted several experiments. Their essence was that the amoeba, using a special needle, removed the nucleus. A few days after this manipulation, the amoeba was dying. No, it did not stop eating, but it stopped almost all the processes. Of course, we can assume that the amoeba was killed because of the "operation", but a repeated experiment in which the nucleus was not removed but merely moved it showed that the amoeba does not die as a result of such interference.
The next organelle, without which can notto exist a cell is mitochondria. It is surrounded by a double membrane. The main function of this constituent of any cell is the production of ATP by transporting electrons and processes of oxidative phosphorylation. Despite the fact that the mitochondria have their own DNA, its proteins are encoded by DNA, which comes from the cytoplasm. Given the fact that energy is necessary for the life and normal functioning of all cells, the importance of this organelle becomes incredibly important for a structure such as a cell. The structure of each mitochondria is the same and does not differ. There are two membranes, the first of which is external and serves to separate the mitochondria from the cytoplasm. The second - internal, is separated from the outer intermembrane space and protects the contents of mitochondria from penetration from the outside.
