Tag Archives: India Science & Mathematics Q&A

Cancer and AIDS are two of the most dreaded diseases. They are not highly infectious diseases like the plagues of centuries past, so that people who are with sufferers are not necessarily at risk. But they can be difficult to treat, and there is little hope for patients who have either disease in its advanced stages. The two diseases may …

Blood plays vital role in the life of our body. It is a fluid that circulates through the heart and blood vessels, supplying nutritive materials to every part of the body and carrying off waste products. It is colorless fluid, plasma, in which float myriads of corpuscles. There are of three kinds: red, white and platelets.

Perhaps you already know, which blood group you belong to: A, B, AB, O, Rhesus + Rhesus + (Rhesus Positive), or Rhesus – (Rhesus Negative). But do you know what these letters and signs mean? Although all human blood looks the same when see under a microscope, we do not all have the same type of blood. Some substances, found …

Warm blooded creatures such as mammals have a body temperature which stays roughly the same whatever surroundings they are in. This temperature varies from creature to creature, for example the body temperature of any healthy human is 98.4 degrees Fahrenheit. Some creatures are cold blooded, which means that the body temperature varies according to the animals surrounding. This means that …

There almost 5 liters of blood in the human adult’s body. But it is not the only fluid to circulate. A substance called ‘lymph’ circulates through a network of vessels throughout the body.

A blood donor can give about half a litre of blood. The blood is kept for transfusions to help save people’s lives. The body then makes more blood, but the donor should not give blood again for at least two months. Every year on 14 June, countries around the world celebrate World Blood Donor Day.