Why do veins appear blue in colour?
Wondering why veins appear blue in colour? Find responses from experts on this page.
Why do veins appear blue in colour when they carry blood which is red in colour?
One person suffering from anaemia. She often complains of tiredness and lack of energy. Why does she show these symptoms? Also explain about the need of book lungs. What are the functions of book lungs?
Experts: do respond.