Showing posts from September, 2010
Ears and Sound Our ears not only allow us to hear sounds, thus preventing the world from becoming a silent one, but also act as organs of balance. They collect sounds from the air and pass them to the brain in thick form of nerve signals. More …
Blood groups and blood pressure All blood looks red in colour but in reality its composition may be different. Blood contains red cells and on the surface of these cells are factors called antigens. Antigens are of two types, i.e., antigen ‘A’ an…
Arteries and veins The lifeline for oxygen and nutrients to the entire body consists of a complex network of tubes called arteries and veins. These deliver nutrients and oxygen to the various parts of the body and collect waste and toxic substance …
