The main parts of an ensemble of our body

Because man came out from the animal world, it is not surprising that the structure and work of the various bodies of a man and the higher animals is also very close.
We in our book will deal first of all vital functions of the human body, the Symphony of life. Only after reviewing the most important processes in a living organism, we will be able to understand the basis of the highest manifestations of the work of living matter - mental acts of man, determined not only natural but also the social patterns.
Tiny single-celled organism simplest animal (for example, amoeba) need to maintain their metabolism to perform a number of functions, responsibilities. He must:
- split captured organic food to make it an integral part of participants in their metabolism;
is to absorb water or air oxygen for the normal course of oxidation processes, the main sources of energy;
- to release into the environment of the waste products of metabolism;
- possess the ability to move around to grab food, to escape from enemies, and so on
Along with maintaining his own life, he must realize and reproduction, survival of the species. Finally, being excitable, he changes his activity under different influences: the chemical impact of food properties" is sent to the stimulus, with harmful irritant is removed, etc.
All these functions are performed by one single cell. The higher animals is a kind of "division of labor". The breakdown of food and its transformation into substances which can directly enter into our metabolism, provides a special system of organs of digestion. Supply of all body cells with oxygen, provide the respiratory organs. These two systems represent the path that connects the body with the chemical substances in the external environment. Only through two entrances - mouth and nose - these substances is open main access into the body. The slag produced during the metabolism, called on the scientific lexicon metabolism, removes organs of excretion. For delivery to the cells of the body of nutrients and oxygen from the organs of digestion and respiration, as well as for removal of our cells "slag" metabolism, and deliver them to the authorities the allocation of a special liquid internal environment of the body, the blood, driven continuous circular motion of the circulatory system. So a separate system of bodies perform the work on ensuring the metabolism of the entire organism. Besides the above-mentioned systems there are a number of parties ensemble promoting decent performance of the Symphony of life: the skin, which, with all its softness is a Horny "armor", which protects tissues from harmful outside influences, as well as carrier and some other functions; protective devices struggling with pathogenic microbes; the skeleton, with many organs of the body strong support and protection. An important role in our ensemble performs another system - muscles. If the essence of their metabolic processes animals differ from plants by an inability to photosynthesis, the creation of complex organic substances from inorganic, in the image of their lives they differ from plants first of all it is the power of movement. This property allows them to produce organic food and humans is one of the necessary elements of labour. Not only our body as a whole can move, make locomotion (from lat. locus - place, motio - movement) thanks to so called skeletal muscles. The ceaseless activity occurring in the internal organs, which also have muscle tissue in the form of a special "smooth" muscles. It is essential that the authorities, similar to our systems breathing, digestion, excretion, etc. are in the original form and in plants. Not coincidentally, these systems of an animal organism called vegetative (from lat. vegetativus - plant) . But how different these systems in animals to their counterparts in the plant Kingdom! All the functions and structure of the organism of animals and humans are subject primarily to ensure motion requiring a different level of energy metabolism in hundreds and thousands of times more intense than in plants. Along with the fundamental transformation of these systems in animals appeared two new major system - muscular and nervous.