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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.
Control of Environment: Control of environment is essential for maintaining good health. Environmental factors which are basic to individual and community health are housing
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
what are the four characteristics of respiratory surface
How to make soap Soap can be made from waste fat. Secure some waste fats and melt in a dish. Strain the fat by several layers of cloth. Weigh the fat and then weigh out about o
Q. How is harvest maturity identified? Maturity indices can be determined on the basis of : Number of days from setting, Sight-colour, size and shape, Touch-texture, hardness o
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Life in Forests: Trees are the pillars of the forest upon which much of the other forest life is shaped. Associated with them, there may be more than a thousand kinds of s
Why is there more exchangeable calcium than potassium on clay/humus colloid? Calcium is usually abundant except in acid soils which occur in humid area due to excessive leaching.
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