Advice 1: Why is the blood dark

The bloodthat flows through arteries and veins, contains a large number of different cells that perform specific functions and are responsible for its color. The blood may be dark red or have a lighter shade. All this is due to several reasons.
Why is the blood dark
In blood there is a proteincalled hemoglobin. It contains iron and is found in red blood cells - erythrocytes. This is a necessary condition for transport of oxygen to the body cells and, therefore, maintain life. It is the red blood cells gives blood a red color. Outside of erythrocytes is hemoglobin able to bind oxygen only under the influence of enzymes. Hemoglobin helps carry oxygen from the lungs to the various organs and tissues. The difference in the color of blood is a consequence of different contents of oxygen in its cells.One of the types of vessels are arteries. They carry blood from the lungs and heart to other organs and tissues of the body. This blood is saturated with oxygen, which in turn combines with hemoglobin that gives the blood a bright red color. Arterial blood distributed through capillaries and small blood vessels with thin walls that carry oxygen and nutrients to all other klinkum of the body.Product exchange, which is produced by cells is carbon dioxide. It enters the blood through the capillary walls. From the capillaries that the carbon dioxide rich blood flows into the veins, which is another type of blood vessels. Through the veins the blood goes to the lungs and heart. Dark red, almost maroon color of blood is due to the fact that it lacks oxygen. In addition, the red blood cells decrease in size and lose their rich bright color. When the blood reaches the lungs, carbon dioxide penetrates into them. At this point in the brain receives the signal that has accumulated in the lungs carbon dioxide, the brain gives the command to breathe out, and all carbon dioxide emitted into the air. After that, the person making the breath, the blood is re-oxygenated, and the process starts again.

Advice 2: Why the blood

Various diseases and injuries can cause damage to blood vessels and lead to bleeding. To avoid massive blood loss, it's very important to immediately resort to medical help.
Why the blood
The main reasons for bleeding is an inflammatory process or a tumor on the walls of blood vessels resulting from mechanical damage or disease. It can also be caused by violation of the integrity of the vessel wall caused by poisoning, infection or lack of vitamins.If we are talking about the causes of hemorrhage from the cavity of the nose, it could be increased blood pressure, trauma, infectious and respiratory diseases. The nosebleed people often suffer with sudden changes in atmospheric pressure, heat exhaustion, intense emotional and physical stress. Causes of internal bleeding of the digestive system is usually a violation of the integrity of the intestinal wall or the mucosa of the stomach. About fifty percent of this type of bleeding is triggered by the peptic ulcer. In addition, the flow of blood from the rectum can be caused by complicated by diverticulum, cancer of the colon or of the cecum and pain in the chronic form. But not always rectal bleeding is so dangerous, sometimes it can be caused by cracks in the anus or provoked scratching in this area.Whatever the localization of the bleeding, it is necessary to take into account the force of the flowing blood, what color it is. When bleeding from the back passage you must inform your doctor about other disturbing symptoms, such as changes of stool, pain syndrome etc. About the presence of internal bleeding, the cause of which may be injury to internal organs, diseased for a long time may not even be aware. In such cases it is especially dangerous bleeding of stomach, in which there is accumulation of blood in the internal cavities. The signs of this condition could be considered pale skin and mucous membranes, weakness, rapid weak pulse and listening to low blood pressure. If we talk about uterine bleeding, their causes are many. They can be caused by inflammation of the reproductive organs, disturbance of function of the endocrine system, toxicity of the body and even a strong psychological tension. Also provoke uterine bleeding may be the lack of rest in continuous operation, the presence of polyps and tumors of the uterus, the use of certain drugs.
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