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What is Blood?

Blood is a highly specialized circulating tissue consisting of several types of cells suspended in a fluid known as plasma. It consists of red blood cells (erythrocytes), which carry respiratory gases and give it its red colour because they contain hemoglobin (an iron-containing protein that binds oxygen in the lungs and transports it to tissues in the body), white blood cells (leukocytes), which fight disease, and platelets (thrombocytes), cell fragments which play an important part in the clotting of the blood.

Medical terms related to blood often begin with hemo (haemo) - or hemato- (haemato) from the Greek word "haima" for "blood." Anatomically, blood is considered a connective tissue from both its origin in the bones and its function.

Some of the functions of blood are:

1. Supply of oxygen to tissues
2. Supply of nutrients such as glucose, amino acids and fatty acids
3. Removal of waste such as carbon dioxide, urea and lactic acid

The blood is circulated around the lungs and body by the pumping action of the heart. Additional return pressure may be generated by gravity and the actions of skeletal muscles. The average adult has a blood volume of roughly 5 litres

Information obtained from the Wikipedia web site. Wikipedia the free encyclopedia.

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