Labels:daily OCR: BLOOD LOOD IS the thick, red fluid that circulates through the body's blood vessels Its main role act as a transport system delivering oxygen and pooy to the body tissues and removing carbon dioxide and waste products from the body Blood is also needed defend the body against disease and keep fluid levels stable It is made of four parts: white and red blood cells (red cells give blood its colour); cell parts called platelets; and clear fluid called plasma An average adult carries about pints of blood, which are pumped around the body by the heart. pooj
