Red blood cells have a ____ pigment (colour) called haemoglobin. When ____ enters the blood, it enters the red blood cells and attaches to the haemoglobin. It then travels in the blood attached to the ____. When the blood arrives at the cells, the oxygen gets released into the ____. Some white blood cells can surround ____ and other foreign organisms that enter the body. The ____ then take the organism into itself (engulfs) and digests it. Other white blood cells may produce ____ - these hold the invading organism so that the engulfing cells can capture them. Platelets play an important role in helping the ____ to clot whenever a blood vessel gets damaged. This ____ prevents blood from escaping and it also prevents microorganisms from entering the body. Most types of blood cell are made in the ____ marrow - the soft substance found in the centre of the bone.

How do the blood cells carry out their function?

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