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Define White Blood cells (WBCs)
WBCs are also called leukocytes, as they are colourless. They are the army of the human body. Whenever a germ or infection enters our body, the WBCs snap to attention and destroy the culprit. Their primary function is to produce antibodies (humoral immunity) or kill the invading bacteria directly (cytotoxic immunity). We will learn more about this later in the next unit on the Immune System.
Explosives : As defined earlier, explosives release a large amount of gas and energy in a very short time. These are of four basic types: Mixed gases - Usually the mixture
As glaciers erode the surface over which they move, sets of parallel linear grooves are sometime worn into the rock surface. These grooves are known as: Striations
How does the intercourse work?
is perkin''s condensation possible in aliphatic aldehyde?
Question 1 Outline the risks of nuclear fissions Question 2 Comment on semiconductor devices and their usage Question 3 In a total system approach, what are the various
Freezing Systems Different types of freezing systems are available for foods. No single freezing system can satisfy all freezing needs, because of the wide variety of food pro
Walking Robots: Sit back for a while and try to think of a few advantages our legs have over wheels in moying around. Wheels can't climb stairs. They can't also step ove
Precautions : The following must always be observed while dealing with lasers. 1) Never look along a laser beam or expose any part of your skin to it. Beware of reflected laser
Describe the factors which decide the broad area of scientific activity?
A simple balance Suspend a ruler by loops of cord a short distance above a table top, as shown in the diagram. When the ruler is in balance, place identical coins in dissimilar
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