Body Systems # 001
All living creatures on Earth, except humans, have a very limited, tough life program. Moreover - it is the same for everyone. The main reason for the existence of a lion - the king of animals, and a tiny polar flower growing on the edge of the earth - leave behind offspring. As numerous as possible, as viable as possible. What is required for this? First of all, of course, the preservation of one’s own life. At all costs, except for the life of their offspring. Nobility? No - just those who cared little for their cubs contributed to the extinction of their own kind. The program of egoism could not gain a foothold in a series of generations - animal egoists more often remained without cubs. To save life, food is needed. Its extraction is the broadest and, so to speak, everyday program. No animal usually invents new means and methods for this. Besides the fact that it is adapted to certain foods, its nervous system stores many instincts associated with its production. Instinct is nothing more than a clear program of action, which is included in certain conditions. Take a closer look at how chickens behave in search of food, how often they perform actions that are not currently caused by necessity. All these life programs - albeit very simplistic, primitive ones - can be found even in a unicellular organism. They are embedded in every cell of a complex multicellular creature. But here they are never fully implemented due to the distribution of responsibilities between bodies. Muscle fibers only contract, neurons can only transmit excitation. All other programs are prohibited for them. How is centralized management of such a huge economy carried out? After all, it consists of many billions of cells, and each of them is a potential troublemaker, ready at any moment to get out of obedience. You can’t keep an overseer for everyone. This is not required. Complex organisms in the process of evolution have acquired several regulatory systems.
The oldest (and therefore the most primitive) way of subordinating a common goal was born a very long time ago. Already in the first multicellular part of the cells was isolated from the environment. These inner cells initially performed the same duties as everyone else. But the products of their exchange did not disappear without a trace in the ancient sea, but accumulated. And they received food not directly from sea water, but from cells of the outer row. So the connection was formed - the inner cells secreted some substances that the outer ones had to react to. This happened every time when the composition of the liquid medium of the body itself changed - there was a lack of nutrients, excess salts accumulated. Gradually, the internal cells finally took on the “guard” role. Such law enforcement officers have survived to this day in the most complex organisms. They turned into endocrine glands and are engaged in the production of hormones and chemical regulators of the main life processes. They are responsible, for example, the growth of the body. This is a troublesome business, stretched out over time, but requiring concerted action by almost all organs. The hormonal system is very convenient for this - it transfers the necessary information (of course, chemically encrypted) with a blood stream washing all the cells of the body. By the way, the mechanism of action of hormones is reversed only now. Rating online casinos: https://www.gamblers.casino Play and win!
Body Systems # 001