The human circulatory system includes the heart, blood vessels and blood. Oxygen and nutrients are carried to every cell in our bodies by blood. Blood also picks up waste products (such as carbon dioxide) to remove from the body.
A bulk of blood is made of plasma. RBCs, a.k.a red blood cells float in the plasma that carries oxygen, WBCs or white blood cells form a part of our immune system, and the clotting cells are called the platelets.
There are two major ways to classify blood groups: the ABO and the Rh systems. Other blood group systems also exist. More than 300 minor blood groups have been identified to this date, with new antigens still being discovered.
A, B, O, and AB are the four principal blood groups. The genes determine a person's blood group they inherit from their parents. Every blood group can be either RhD positive or negative. All together, they make up 8 main blood groups.
A person's blood group is determined by a pair of genes - a single gene inherited from each parent. Each blood group is identified by its own set of molecules (also known as antigens) located on the surface of red blood cells. When a person needs a blood transfusion, the donated blood must match the recipient's blood; if not, there will be complications. The ABO system defines 4 main blood groups as below.
Blood group O is the most general blood group and can safely be given to any other group. Obtaining blood from the incorrect ABO group can be a threat to life.
A Group B person must never give blood to Group A and vice versa.
Blood types of humans are also categorized as Rhesus type, now we call it 'Rh type.' Your Rh type is determined by a different pair of genes.
Blood can be either Rh-positive or Rh-negative, based on whether certain molecules are present. Rh-negative people will experience a severe immune-system reaction if Rh-positive blood gets into their bloodstream. Sometimes, the red blood cells have another antigen, known as the RhD antigen. If this exists, then the blood group is RhD positive; if not, the blood group is RhD negative.
One can be any one of the following eight blood groups:
O- can be administered in medical emergencies when the blood group is unknown. It is safe for most utmost receivers because it does not have an A, B, or RhD antigens on the cells covering and is most compatible with every other ABO and RhD blood group.
Donating blood is a simple and safe way to make a big difference in people's lives. Keeping yourself informed of the process before, during, and after you donate blood can help you prepare for the process. Most people can give blood, but only 1 in 25 people do.
Who gets the benefit out of blood donations?
One can donate blood if one is:
If one donates whole blood, they need to wait 56 days between donations, or even longer. If one is donating platelets, they can do this every 7 days, up to 24 times a year.
Side Effects After Donating Blood:
While there are no lasting side effects, one might temporarily: