It is a fluid. All humans and all animals have this. Somebody can donate it. Somebody can accept it. It does a broad service to make us alive because without it, the body would stop working. It circulates. Its color is red. Now you may make a guess about this body fluid. It should be none other than blood.

Blood has four main components. Those are plasma, red blood cells, white blood cells and platelets. Blood has many different functions. Main function is transporting oxygen and nutrients to the lungs and tissues. Forming blood clots to prevent excess blood loss, carrying cells and antibodies that fight infection, bringing waste products to the kidneys and liver, which filter and clean the blood, regulating body temperature are some of other functions.

Human body’s blood is always red. But there is a famous myth which is, the blood is red when it is with oxygen, and blood is blue when it is without oxygen. Actually, this is a pretty false fact.

There is no blue blood in human body. Difference is that when it is oxygenated, it is bright red, and when it is depleted of oxygen, it is darker red. The only reason for the red color of our blood is tiny amount of iron. But some animals though, use a different mechanism to transport oxygen. Instead of using iron, they use copper. Copper also likes to bind to oxygen. When copper combines with oxygen, it turns into greenish blue.

Seven to eight percent of your total body weight is blood. An average-sized man has 12 pints of blood in his body, and an average-sized woman has about nine pints.

Although all blood is made of the same basic elements, not all blood is alike. In fact, there are eight different common blood types, which are determined by the presence or absence of certain antigens; substances that can trigger an immune response if they are foreign to the body. Main types of blood by the presence or absence of two antigens A and B are, group A , group B, group AB and group O. In addition to the A and B antigens, there is a third antigen called the Rh factor, which can be either present (+) or absent (–). Thus, main four blood groups split into eight types by Rh factor. O positive is the most common blood type, but Asian people have a relatively high number of Bs. How is your blood type found? It is inherited. It passes genetically from your parents. That means your blood group is based on the blood types of your mother and father.

We can share our blood with others. It can be called as blood donation. The first theory is that blood donors must be ‘healthy’ before they roll up their sleeve. Healthy means that you feel well and can perform normal activities, and shouldn’t have diabetes, cholesterols and communicable diseases. Blood pressure should be normal. Age should be between 18 to 60 years and weight should be minimum 50kg. Hemoglobin concentration of blood should be 12 g/d. A donor with an acute infection should not donate. If you are eligible to donate blood, make sure to drink plenty of fluids on the day of your donation.

If possible, include iron-rich foods in your diet, especially in the weeks before your donation. Benefits of being a blood donor are feeling great, reduce the cancer risks, reduce the heart risks, and boost the reproducing of new blood cells and weight loss. The universal donor is O negative blood type. The universal recipient is AB positive blood type.

Blood is much unrivaled creation of nature. It provides well-balanced service in human body. We can do blood donations as well. Blood donation is a simple and very safe procedure so there is nothing to worry about. So you have an opportunity to save another life easily through your blood.