The basic principles of the structure and activity of the organism

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Long digestive tube with adjacent thereto large and small digestive glands stretches from the head to the lower end of the trunk; forming numerous curves and loops, it fills a large part of the abdomen. In the neck of her depart airway - the larynx, which continues into the trachea. The last stretches into the chest and is divided here into two bronchi that are included in the lungs and repeatedly branching in them. Heart and lungs fill up almost the entire volume of the chest cavity.
Substances obtained from food and oxygen enter the bloodstream, which carries them around the body. Here (in the blood) come from cell metabolic products, which are subject to removal; they are delivered to the excretory organs. Blood flows through the extensive system of tubes - the blood vessels. In the movement of her causes heart. Blood vessels penetrate all parts, all the organs of the body. All the blood within days repeatedly passes through the heart, and every particle during this time, moves from one body to another. Thus, the blood and circulatory system connecting all parts of the body, combine them into a single system. It supplies all the internal organs, muscles, bones, joints, and brain.
In the body there are hundreds of bodies, but each of them is part of the whole system of the body and serves his needs. Naturally, the harmonious combination of the activities of all parts of this complex "economy" is possible only with reliable and accurate control exercised by the nervous system. The brain and spinal cord make up the Central Department. Through numerous nerves are connected with all parts of the body.
The human nervous system functions as an extremely complex cybernetic device which has no equal either in nature or in the technique. Continuously receiving a huge flow of information from internal organs, the heart, blood vessels, apparatus of the movement and from the external environment through the senses, it regulates and coordinates the activities of all bodies in the interests of the whole organism. Nervous system regulates the whole regime of his inner life in accordance with the terms of the external environment; it defines and all forms of behaviour of the individual. Its most important assistant in management are the endocrine glands.
This is the General scheme of the structure of the body.
It is fair for higher animals and man. But the structure of the latter differs in many significant features.
Noble appearance and beauty of a healthy person vividly reflect its special features. Vertical position led to the formation of a broad chest and back; developed the mighty muscles of the back, buttocks, the calf muscles of the shins - all this created a peculiar form of the human body. Bipedalism freed his arms, and let them gradually be formed in a very special body of work. Labour activity of a human and collective way of life promoted development of the brain, reached in the evolution of the huge size and extremely complex structure that provides the highest form of nervous activity - thinking, inherent to man.