What are the properties of blood

Blood components

To date, it has not yet been possible to produce a replacement equivalent to blood, a kind of artificial blood for use on patients for transfusion. Scientists call blood a liquid organ.

Our blood consists of two main components: the blood fluid (= blood plasma) and the cellular solid components. The solid components, the so-called blood cells, include the red (erythrocytes) and white blood cells (leukocytes) as well as the blood platelets (thrombocytes). The blood cells are made in the bone marrow.

Every cell and every particle has a necessary function in the blood, such as the transport of oxygen and nutrients, the defense against pathogens, hemostasis and the transport of heat within the body.

The vital blood with its diverse tasks and functions can only be produced by the body itself. Nothing can replace it. That is why it is so important that there are people who donate their blood for the sick and injured.

Components of the blood

Red blood cells (erythrocytes)

transport oxygen from the lungs to the body cells and carbon dioxide back to the lungs. They contain the red blood pigment hemoglobin, a protein that binds oxygen in the lungs and transports it to all parts of the body, for example to the muscles and internal organs. There are about 25 trillion in an adult body. These will be replaced after 120 days. The red blood cells were first described by Jan Swammerdam in 1658.

Blood platelets (thrombocytes)

are vital for blood clotting and form the basis for wound healing. Over a trillion tiny blood cells circulate in the bloodstream. They are replaced by the body's own new blood cells after seven to twelve days.

Blood plasma

is the blood fluid. The blood plasma makes up about 55 percent of the blood. It consists of around 90 percent water, the remaining ten percent contains nutrients as well as factors for blood clotting and defense against infection. The nutrient building blocks (glucose and amino acids) are transported with the blood plasma to all body cells, where they serve as an energy supplier and building block. Minerals, vitamins and hormones are also distributed in the body by means of the plasma. A large part of the body's metabolic end products, such as B. carbon dioxide brought to the excretory organs such as the lungs and excreted. In addition, the blood plasma is responsible for transporting heat within the body. It is replaced by the body within six hours.

White blood cells (leukocytes)

belong to the immune system and perform special tasks in the defense against pathogens and foreign structures. They form appropriate antibodies. Their lifespan is about ten days.


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