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Human blood is red because of the iron in the haemoglobin. This gives red blood cells their red colour. Veinous blood is much darker than arterial blood, and your teacher is right that oxygenated (arterial) blood is 'redder' than deoxygenated (veinous) blood. However, human blood is not blue. Some animals do have blue blood though.
Best Answer: No, not pus. When you get a cut, there is bleeding. Blood is basically a fluid called serum which contains lots and lots of red blood cells, white blood cells, platelets and many other proteins and things. When the clot forms, there is liquid left which is squeezed out as the clot forms.