Publié par happy-diet lundi 19 juillet 2010

The human body consists of cells in different forms and functions.
In a simple, every cell contains an outer envelope and the nucleus, and the information is kept basic nucleus of the cell. This information in fact be present in the DNA molecule DNA - deoxyribonucleic acid. Contains the DNA on chromosome 26, which in turn is composed of millions of genes. These genes are determined by the system and the functioning of the cell.

During some of our body's cells die naturally and the body compensates for this decrease in the cells by division. When the cell division to produce another copy of the DNA and then divided into two cells. This is what happens in the cell is simplified as the process of division more complicated than that. Cell division usually occurs on a regular basis so that our bodies growth or to replace or repair damaged tissues. When you work cells as planned, we enjoy good health, but when that system breaks down, we get sick. In the case of cancer cells grow unnatural and instead of compensating the damaged cells only, these cells proliferate significantly and non-stop on the proper problem of so-called limb swelling.
Tumors that result from this imbalance of two types:

Benign (not cancerous Benign): They are usually packed membrane and non-dispersible, but some may cause problems for the patient, especially if a member of the large size and the impact would be pressure on the member or members of the patient near them, preventing them from functioning normally. These tumors can be removed surgically or treated with drugs or X to minimize the size and that is sufficient to heal them and often do not go back again.

Malignant neoplasms (cancer Malignant): is the subject of the site. Tumors attack and destroy the cells and surrounding tissues and have a high potential for spreading. They spread in three ways

Spread directly to the tissue and organs surrounding the injured member
Through the lymphatic system.
Through the blood, where separate cell (or cells) of the cancerous tumor to the initial Primary and transmitted through the device Allmphoui or blood to other organs far enough to settle in somewhere - often members of the rich blood, such as lung, liver or lymph nodes - causing the growth of cancerous tumors other called secondary tumors Secondary.

Cancer is a group of diseases (more than 100 disease) are similar in some characteristics with each other, has been designated cancer because the blood vessels around the tumor bulging sides like lobster. This disease, or these diseases result from the cell out of control. Change occurs in a cell, making it beyond the control system that controls the cell's functioning, as in the healthy cells. There are more of a theory due to the beginning of the cause of cancer in the body. The first says that error occurred in the DNA at the division which is called the situation "change" or mutation. The incidence of error in the DNA at the division over the increasing exposure to carcinogens such as tar in cigarette smoke. Many of these differ according to their causes errors occur in the human body but the body's immune system recognizes them to differ from the rest of the cells and destroy them. Sometimes the immune system fails to identify those cells to its similarity to the rest of the cells, whereupon the presence of division and cause cancer.
One recent theory says that the reason is the existence of a simple genetic defect can not be seen from the immune system and the imbalance with time may cause the exit of the cell and then control the appearance of cancer. This theory explains the appearance of some types of tumors in more than one individual from one family.

Carcinogens Carcinogens: whether there is a genetic defect or not, there are known to cause cancer and is divided into three sections:

Physical carcinogenic particles such as radioactive isotopes, ultraviolet light and some metal fiber Mineral fibers. The isotope work of the holes for the nucleic acid when exposed to it, causing imbalance in gene regulation. Come radioactive isotopes of X-rays, cosmic rays that reach the ground and radon gas (found naturally in the Earth to varying degrees) as indirectly. The UV radiation, which comes from the sun and caused the association of some proteins in the DNA at the time should not be as well, causing a defect in DNA. Some metals, such as the asbestos fibers cause direct destruction of nucleic acid because of its large size.
Cancer-causing chemicals such as the Benzopyrene located in cigarette smoke and the vinyl chloride used in plastic industries where particles are linked with DNA, causing the imbalance.
Biological carcinogens such as viruses or bacteria which cause an imbalance in the cell to turn into a cancer cell. Examples of viruses with human papilloma virus causes cervical cancer, virus and hepatitis B (hepatitis B virus), which causes liver cancer, the most common cancer among men in Saudi Arabia. The types of bacteria helicobacter pylori, which causes stomach cancer.
Cancer passes through the growth in three main phases:
Home (Initiation): This first step towards the formation of tumor begins at the level where the cell by simple changes in their work and how to control this work materials that cause this initially called carcinogens (carcinogens).

Development (Progression): tumor is composed by one cell and have success in growth and division at the expense of other cells, in this stage can be seen Mkroskubia

Clinical tumor (Clinical): here is a large tumor size, if not treated will continue to grow and destroy adjacent tissues and may spread to distant organs.

Cancer as we have not a single disease, is a disease differ in different cells which gives rise to. And for some it marks a different behavior Some fast-growing and one slow, some fast spreading and another does not spread quickly. But all of these types have similar characteristics with different patients.
Cancer treatment varies depending on the type member of the tumor or the patient. In general, highways to treat cancer are surgery, removal of the member or infected tissues, radiation therapy using x for the treatment of tumor, chemotherapy drugs using chemical and hormone therapy, using the hormones for some types of cancer and they're going to these methods in detail

The definition of brain cancer:

Division is abnormal and irregular cells to the brain both in the brain, the cerebellum or spinal cord, which causes compression of the other parts of the brain and therefore the loss of one of the senses, or weakness.
And primary brain tumors (ie, those originating in the brain) are very rare, unlike secondary brain tumors which are due to the spread of the disease from other members of the body and into the brain.
Symptoms: brain tumors, whether benign or malignant cause similar symptoms, which vary according to place of occurrence of the brain. It is these symptoms:
1. Headache, especially that which affects a person in the morning.
2. Nausea and vomiting.
3. Cause convulsions.
4. Weakness of some of the parties Kalalloip or lower.
5. Some senses weakness or vulnerability.
Causes: it has no known reasons so far.
Diagnosis: work-ray scan of the head to make sure that the work of a tumor after clinical examination. Similarly, the examination of the nervous system is important in order to find out where the infection in the brain.
And other tests that could be made is the injection of color in one of the arteries feeding the brain and then photographing the head showing where all the arteries there. This examination is carried out if there is an intention to undergo surgery to remove the tumor
Methods of Treatment:
1. Surgical intervention to remove the tumor if the spot to remove the pressure on other parts. But sometimes it is difficult to make the process if the tumor is near the site of a vitally important role in the brain.
2. Radiotherapy.
3. Chemotherapy with interest that it is limited as the drugs can not enter the brain through the blood vessels, but can be injected the drug in the cerebrospinal fluid.
No methods of protection from the lack of knowledge of causes or factors leading to it.
Most important types of brain tumors: • Gliomata
• Glioblastoma Multiform
• Astrocytoma
• Acoustic Neurinoma
• Meningioma
• Pitutary Tumours
• Transitions secondary to other tumors such as lung cancer or breast cancer ..

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