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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.
Explain somatic mutation theory of ageing Random mutation makes the cells inefficient. An increase in the number of mefficient cells in an organ impairs their functioning. Rand
Importance of Parent materials Different rocks or parent materials placed under similar climatic conditions give rise to soils which are very similar to one another. On the o
Write an essay to answer the following question: How can social scientists explain human behaviour scientifically?Discuss the merits and limitations of the applications of the sci
What is tha nature and scope of zoology?
Extra-terrestrial life: Just as we have been curious about how life originated on the Earth, we have also tried to explore whether there is life on any other planet in the Sol
In a unicellular organism, the interior region of the organism is no longer in contact with the external environment. Thus simple processes of diffusion, phagocytosis, exocyt
1. city destroyed by earthquake in 1923? 2.the place where two plates collide and one goes over top the other? 3.sudden stress changes in the earth that cause ground shaking.They o
what is an easy way to learn everything about photosynthesis?
Define Growth Hormone (GH) It is a protein containing 19lamino acids in a single chain. It is secreted by somatotrophs throughout life even though growth stops at adolescence.
Marasmus: This is caused due to the severe deficiency of both proteins and calories in the diet. Nutritional surveys among pre-school (1 to 5 years) children show that more t
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