Blood is essential to life. Blood circulates through our body and delivers vital substances such as oxygen and nutrients to the body’s cells. Additionally, blood transports metabolic waste products away from those same cells. There is no substitute for blood, and it cannot be made or manufactured artificially. Therefore, patients in need of a blood transfusion can only rely on generous blood donors.
Blood cells develop from hematopoietic stem cells which are formed in the bone marrow. There are two main types of stem cells within the bone marrow – myeloid and lymphoid – which transform to form the different blood cells in our blood. Once the blood cells are mature, they are released from the bone marrow into the bloodstream. Donor stem cells sources may be used to treat a variety of diseases, including leukaemia, lymphoma, bone marrow failure, and some immune disorders.
Blood cells develop from hematopoietic stem cells which are formed in the bone marrow. There are two main types of stem cells within the bone marrow – myeloid and lymphoid – which transform to form the different blood cells in our blood. Once the blood cells are mature, they are released from the bone marrow into the bloodstream. Donor stem cells sources may be used to treat a variety of diseases, including leukaemia, lymphoma, bone marrow failure, and some immune disorders.
Blood has many different functions, including:
Blood carries oxygen with red blood cells from the lungs to the rest of the body. Then it takes any waste products and transports it to where it can be passed out of the body appropriately.
It balances the acidity and alkalinity of your body. It also helps to regulate your body temperature.
White blood cells are responsible for a significant role in helping the body’s immune system by attacking and destroying pathogens. Platelets are responsible for blood clotting, which prevents the excessive loss of blood after an injury.
Red blood cells have specific proteins on their surface; they are called antigens. Your plasma also contains antibodies which will attack specific antigens if they are found. While there are various types of red blood cell antigens – the ABO and rhesus types are the most important. Your blood group depends on which antigens which occur on the surface of your red blood cells.
If you have Type A antigens on the surface of your red blood cells, you also have anti-B antibodies in your plasma. You have blood group A.
If you have Type B antigens on the surface of your red blood cells, you also have anti-A antibodies in your plasma. You are blood group B.
If you have both Type A and Type B antigens on the surface of your red blood cells, you do not have antibodies A or B antibodies in your plasma. You are blood group AB.
If you have neither Type A nor Type B antigens on the surface of your red blood cells, you have both A and B antibodies in your plasma. You are blood group O.
The blood group is considered positive or negative based on the presence or absence of the Rhesus antigen respectively.
The information on the Centre For Clinical Haematology website is intended for educational use. It should not be considered or used as a substitute for medical advice, diagnosis or treatment from a qualified health professional.
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