Nervous system
The nervous system is the communication device in the human body, through which the human interaction with the changes occurring inside and in the outer environment, and the brain is the center of control in the nervous system and the body, where the nervous system transfer information to the brain, and the brain analysis and the issuance of information to members, Through the musculoskeletal system, the nervous system is responsible for a large number of processes and movements within the human body, such as heart beat and breathing.
The nervous system is divided into two parts, namely, physical nerves; it is responsible for the muscles of the body and muscles, and the function of this section of the nervous system to receive, analyze, process and respond to external information, and the second section is called the autonomic nervous system; this organ is responsible for internal organs in the body, The device is exposed to chemicals in large quantities, through human exposure to many of its daily activities and life, such as the use of pesticides and chemical fertilizers in agriculture, and chemicals for daily cleaning, and these substances have a large impact on the health of the digestive system.
Methods of entering chemicals for the body
- Respiratory, volatile chemicals enter the human body through respiration of these substances. These substances include gases, droplets, dust, and fumes. These chemicals absorb all the parts of the respiratory system that pass through. Absorption and degree are largely due to the nature of the substance and its chemical and physical properties , And also to the physiological structure of the organ of the respiratory organ.
- Skin There are many chemicals that can penetrate the skin and reach the blood, especially the chemicals in the chemicals that are dissolved, and these substances can be transmitted into the human body through the wounds and cracks and scratches on the surface of the skin.
- Eat contaminated foods and beverages, such as ingestion of certain chemicals at work or accidentally in accidents.
- Other ways to enter the chemicals of the human body, such as smoking and through the fetal placenta of the fetus.
Effect of chemicals on the nervous system
The influence of the nervous system on chemicals depends largely on the toxicity and concentration of these substances, as well as their physical and chemical properties. These effects are divided into several sections:
- Acute effects, these effects appear quickly and directly, and can appear after a short period of time, and this effect is due to exposure to chemicals at high concentration.
Chronic effect, this effect is shown by the exposure of a large, continuous and repeated of these substances, and usually the concentration of these substances is few.
- Topical effects, and are clearly visible on the parts that have been exposed to chemicals such as nerves of the eyes, nerves of respiratory tracts, and skin nerves.
- Systemic effects, a change in the functioning of the nervous system to its normal functions.
- Effects of organs or target devices, this effect is limited to one or two parts of the nervous system.