The right order is Macromolecule ==> cell ==> tissue ==> organ ==> organ system.
1. Macromolecule
A macromolecule (or polymeric molecule) is a very large molecule, which has a relatively high molecular weight. The concept of macromolecule was introduced in 1922 by the German chemist Hermann Staudinger. A macromolecule formed of similar chemical units joined by covalent bonds can be described as a polymer molecule, a set of such molecules is a polymer. Many proteins can also be considered as macromolecules.
2. Cell
Cells are essential elements for our body. They constitute all the organs and tissues of it and ensure its proper functioning. Of variable size, each cell has the same structure and communicates with each other.
Cells are essential elements for our body. They constitute all the organs and tissues of it and ensure its proper functioning. Of variable size, each cell has the same structure and communicates with each other.
<u>There are two types:
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Eukaryotic cells: they have a nucleus containing the genetic material (example: the man, the yeast).
Prokaryotic cells: they are devoid of nucleus, their genetic material is free in the cell (example: bacteria).
3. Tissue:
A fabric is a set of cells not necessarily identical But, of the same origin, grouped into a functional whole, that is to say, contributing to the same function.
There are 4 types of fabrics:
* Epithelial tissues;
* Connective and supportive tissues;
* Muscle tissue;
* Nervous tissues.
4. Organ:
An organ is a part of a living being with a specific function to enable it to live; for example: the lungs for breathing, the heart for blood circulation, the stomach and intestines for digestion, the kidneys for filtering the waste contained in the blood, the bones of the skeleton to ensure the internal solidity of the body , the indispensable muscles for movements, the sexual organs for the reproduction of new ones.
5. Organ System
Although each organ (tissues and organs) has its specific functions, the organs also function in groups, called organ systems (Main organ systems). Doctors categorize disorders and their own medical specialties by organ systems. For example: the digestive system, the cardiovascular system, the musculoskeletal system.
