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Explain the Muscle layer
This layer consists of two layers of smooth muscle. The outer layer is a longitudinal muscle layer and the inner layer is a circular muscle layer. But there are some exceptions in some organs. Between these two muscle layers, there is a network of nerves called the myenteric plexus. It contains both sympathetic and parasympathetic nerves. The contraction of this smooth muscle layer is called peristalsis. You would realize that it is by peristalsis that the food contents of the gastrointestinal tract are pushed onwards.
TO SHOW THAT AIR HAS WEIGHT Drive a thin nail by the exact centre of a long rod such as a metre stick or a yard stick. Balance the stick by resting the nail on the rims of two
Explain the Colour Blindness Normal individuals possess three cone pigments viz. red, green and blue which are referred to as tri-chromates. Colour blindness refers to the part
A stone seems to weigh less in water Weigh a large stone on a pair of kitchen scales. Put a loop of heavy string around the stone and weigh it again suspended in a pail of wate
how the metal tyre is fitted on the wheel of a bullock cart?
The difference between weight and pressure Make two square blocks of wood, one much lesser than the other, and link them together as shown in the diagram. Press every of these
List any three human activities that you think would lead to air pollution. The following three human activities would lead to air pollution: (i) Burning of fossil fuels such
Conservation of mineral resources: Mineral reserves are present in a limited quantity and they can be exhausted. At the present rate of consumption many of them will not last
A lift pump To change the syringe and make a simple lift pump, burn two holes by the piston with a hot wire and fit a thin piece of leather or rubber above them to act as a val
Aspirations: We often have to make decisions and choices about hdw to spend our time, money and energy. Sometimes the choices are simple like whether to wear a blue dress or
solutions that can be found in home and its characteristics
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