Why do we have two nervous systems? Detailed answer

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Why do we have two nervous systems? Detailed answer

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Why do we have two nervous systems?

The human nervous system is like a network of wires, along which commands come from the brain. Thus, a connection is made with every part of the body. The brain is a kind of center of such a system. Commands from the brain through nerve fibers come out, which is why laughter arises, appetite is stimulated, sexual desire arises, etc. Nerves serve the brain as messengers. Through special parts of the nervous system, the brain receives information about everything that happens to the body.

The spinal cord is the main communication route between the brain and the entire body. The spinal cord is located in the spine and combines the nerve trunks in the same way that a telegraph cable combines wires. Each trunk has two pairs of nerve roots: anterior - the so-called motor, and posterior - sensitive.

Sensory roots transmit signals from the skin, muscles, internal organs to the spinal cord, and from there to the brain. Motor roots transmit signals from the spinal cord to different parts of the body. The sensory roots control sensations, and the motor roots control actions. When someone touches us, we feel it through sensitive nerve roots.

If we move, impulses from the brain are transmitted through the motor roots. This nervous system is called the central nervous system. It is responsible for all our conscious actions and for responses to external stimuli. Without the central nervous system, we would not be able to think, move and feel. But, as you know, the body can also perform subconscious actions.

Some vital organs must function, although consciousness does not take part in this. For example, digestion and respiration are carried out automatically and independently. The beating of the heart is also an automatic action. These and many other unconscious actions that are performed automatically are regulated by another nervous system. It is called the peripheral nervous system. She has no mind control. It passes through itself impulses coming from the central nervous system. Without such a system, which resembles an intricate network, our life would stop.

So, we need both nervous systems in order to live and function as a human being.

Author: Likum A.

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