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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 the Medulla Oblongata The medulla extends from the pons above and is continuous with the spinal cord below as can be seen in Figure. It is about 2.5 cm long shaped like
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The effect of falling water on topsoil Fill a flower pot with sandy soil or loam. Set the pot under a dripping tap for an hour or more. View how the clay and inorganic matter a
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Some Physical Features of the Atmosphere: i) The atmosphere is a mixture of gases. It is made up of 78.08% nitrogen; 21% oxygen by volume. There is only 0.03% of carbon dioxi
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Explain the Vasomotor Centre and Cardio-Inhibitory Centre The vasomotor centre (in the medulla ablongata) excites the respiratory centre. The pulmonary ventilation is increased
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