Other than imparting immunity to the organism, the blood is also very important in the self repairing mechanism of the body called as Coagulation.
The clot hence formed as a result of this process seals an open wound in order to stop bleeding and prevents blood loss. Here the transport of the nutrients, oxygen and other beneficial substances occurs from the source organs to the cells via blood and likewise the transport of waste materials, metabolites, harmful gases (including CO2) occur from the cells to the blood. Other than the basic transportation function of the supply of oxygen, nutrients and removal of wastes there are also some very vital biological functions performed by the blood. This liquid connective tissue is called as Blood. It basically is a specialized bodily fluid that delivers necessary substances to the cells of the body. It plays a major role in the defense mechanism of the body. As a fluid connective tissue, messenger and transporter the blood also performs the transport of hormones and the signaling of tissue damage.Clotting helps repair and heal the injuries on the surface of the body (and also inside the body). Blood performs many immunological functions like circulation of white blood cells, and detection of foreign material by antibodies. The transport of vital nutrients, oxygen, and drugs and even the waste material, gases etc occur in the body through a liquid connective tissue.
For some people, the nerve at this point does not really show and that's when blood is drawn from the wrist. This helps prevent children from developing a fear of blood tests. This is where the doctor will be able to make you understand what could have gone wrong to begin with. When this happens, its best to talk to the doctor and understand why these tests have been recommended for you. Once you do have the results and you are unsure of what they mean, make sure you speak to the doctor again. A small sample of your blood is drawn. Sometimes, based on the blood test results and the extent of the illness if any your doctor will come up with a treatment programme. For children, a cream based anesthetic is rubbed onto the spot so that the pain from the needle is minimal. Everyone takes a blood test at some point in their life. Blood tests are normally done by haematology department in the hospital or diagnostic center. Sometimes, even if all the results do come back normal, you may be left with a nagging doubt on what the abnormality was in the first place. This is generally taken from a nerve in the middle of your elbow.