Pin
Send
Share
Send


The concept of cell (word from Latin cellŭla) has three great uses. On the one hand, it refers to primordial constituent of living beings , which has the ability to reproduce independently and is composed of a cytoplasm and a nucleus that are protected by a membrane .

The aforementioned cytoplasm is characterized because it is between the other two mentioned parts, the nucleus and the membrane, because it is formed by the so-called cellular organelles (mitochondria, chloroplasts, ribosomes, endoplasmic reticulum, lysosomes ...) and because it has three fundamental functions.

Specifically, these three functions are: the structural one because it is not only the one that shapes the cell but also the key to its movements; the nutritious one then has substances that are then transformed into energy; and storage because it stores reserve substances.

On the other hand, the second component of the cell is the nucleus. This determines that there are two clearly defined types of those. Thus, on the one hand, there are the so-called eukaryotic cells that are those that have a true nucleus and separate from the cytoplasm; and on the other there are the prokaryotes in which the different elements of that one are not only not defined but also present mixed with said cytoplasm.

And finally, as we mentioned earlier, there is the membrane that is characterized by being semipermeable, dynamic and capable of modifying. Likewise, we must underline the fact that it is formed by two organic substances such as lipids and proteins.

Among the most relevant functions that this third component has are to isolate and protect that of what is outside, regulating the passage of nutrients to the cell and the exit of waste, and finally, in relation to the previous purpose , allowing or denying the passage of substances.

On the other hand, a cell is a set of individuals that works independently within a organization , whether of a political, terrorist, religious or other nature. To cite an example that allows us to appreciate this meaning: "Those responsible for the attack were three men belonging to an al Qaeda cell operating in Europe".

Finally, the notion of cell also allows mention to a cell or cavity of small proportions (as it is, to mention a specific case, the cell of a monastery).

In the case of the cells of living organisms, they usually have dimensions microscopic . According to the amount of cells they possess, living things can be classified as single cell (they have only one cell, e.g., the protozoa) or multicellular (It has many cells, such as humans, that we have hundreds of billions).

In 1839 , Matthias Jakob Schleiden and Theodor Schwann they proposed the cell theory , which indicates that all organisms are formed by cells and that these are derived from other precedents. In this way, the vital functions emanate from the interaction between the cells, which even transmit the genetic information from generation to generation.

It can also be differentiated between two large cell types: prokaryotes (which do not have a differentiated cell nucleus, but their DNA is scattered in the cytoplasm) and the eukaryotes (present the genetic information in a cell nucleus).

Pin
Send
Share
Send