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How the lungs work
Cut the bottom off a large bottle. Fit a cork to the neck with a Y tube in it. On every of the lower limbs of the Y tie a rubber balloon or a number of small bladder.
Tie a sheet of brown paper or sheet rubber round the bottom of the jar, with a piece of String knotted by a hole and sealed with wax. Pulling this string lowers the diaphragm and air enters the neck of the Y piece causing the balloons to dilate.
Pressing the diaphragm upwards has the opposite effect.
Define Ishihara's Charts - Colour Blindness Colour blindness is often assessed using Ishihara's charts. If ever you visited an eye specialist, you too must have seen this chart
Explain Haemopoietic function Gastric juice contains the intrinsic factor, which is essential for the absorption of vitamin B 12 . Vitamin B 12 present in food combines with i
describe the factors which decide the broad area of scientific activity
Fortin type barometer A simple Fortin type barometer can be improvised for the junior laboratory. The glass tube is held vertically with single end in the reservoir by two curt
Anthropological Evidence Modern humans arose at a time when the Earth was going through a very cold and icy period called the Ice Age, which began about 75,000 years ago and
Mechanics: Another hnch of science which is, perhaps, the greatest contribution of Greek civilisation is mechanics. Mechanics developed out of the necessities of imgation,
Explain Functions of Gastric Juice - Enzyme action Enzyme action: Pepsin begins the chemical digestion of proteins. It converts proteins to peptones. The enzyme rennin present
Define the Disorders of the Reproductive System Disorders that may affect the proper functioning of the reproductive system include abnormal hormone secretion, sexually transmi
The effect of soil on growing things Get samples of a fertile soil from a flower or vegetable garden, from a wood, from a place where a cellar is life form dug, from a sandy pl
factors which decide the broad area of Scientific activity
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