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Keep volume of water in body constant - Function of Kidney
Keep the volume of water in the body constant by removing excess fluid from the body. The kidneys regulate the volume of extra-cellular fluid by eliminating or retaining water. The re-absorption of water in the tubules is controlled by pituitary and hypothalamic actions. The posterior pituitary produces anti-diuretic hormone (ADH), which increases the amount of water reabsorbed, the adrenal cortex (another endocrine gland) produces the hormone aldosterone, which influences the re-absorption of sodium and water.
State about the Soil Aggregation and Soil Structure In the context of soils the term 'structure' refers to the shape that the soil takes. It may exist as individual particle or
Let us summarise the important points that we have understood about the radiation and chemical hazards in this unit. The radiations, causing severe hazards like cancers, mutations,
Management of Forest Resources: Considering the ever growing demand of wood and realising the importance of conserving our forest resources, it has become necessary to find alt
The Water Cycle Heat some water unless it is near the boiling point. Place it in a drinking glass and rotate the glass so as to moisten the sides right to the top. Place some v
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
Explain the Transfusion of Blood Blood has been considered as the elixir of life. However, in ancient times, patients were bled to get rid of their foul fluid. Later, as blood
Explain Cough reflex Actions - Respiratory Process Cough reflex causes cough due to irritation of some receptors in tracheo-bronchial tree. It is a protective reflex. The irrit
A field trip to a rock quarry The quarry should be visited by the teacher in advance. View how the rock is removed. If the rock is sedimentary, view the layers. Collect rock sa
Explain Mucous membranes - External Defence Mechanism Mucous membranes: The digestive, urinary, genital and respiratory tracts open out at one or both ends. They do not have a
What is the common name for the test that provides the hardness of the material by the size of an indent left in it by a standard steel ball? The Brinell Test
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