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Explain Skin Secretions - External Defence Mechanism
The oil and sweat secreted by sebaceous and soporiferous glands contains fatty and lactic acids, which makes the surface of the skin acidic (pH 3-5). These prevent the organisms from infecting the skin. Some friendly bacteria, which reside on the skin checks growth of microbes to a certain extent. Lysosomal enzymes of the skin have a bactericidal effect. Thus the skin becomes a self-disinfecting organ.
What is shale? It is a fine-grained, earthy, sedimentary rock like clay, but produced in thin layers.
How does our body know 'what to do' Feeling, knowing, doing anything depends on special structures called nerves. Neuronal cells in the body act as various messengers according
The angle of insolation on the Earth's surface is most direct at which latitude: At 0 o latitude
Pollution due to Radiations: Hazards of nuclear radiations are extremely serious, because they upset the genetic make up of the living beings. Environmental pollution from
Are there any interesting fish
Explain the Autoregulation function of kidneys The kidneys possess the property of autoregulation. This means that the blood flow in the kidneys remain constant. It is independ
describe the differences between GDP and GDP per capita
What is Dry manure Dry manure though contains 80 percent carbon, yet it is considered primarily as a nitrogen fertilizer and, to a lesser extent, one of potassium. Losses of nu
Define the term Bel Bel, the unit of measurement of sound, is named after Alexander Graham Bell; Bell was the inventor of the telephone, but for some curious reason, is spelt w
What is Heart Sounds? Have you ever heard your heart go lub...dub...? What are these sounds? "Lub" is the closing of the atrioventricular valves while "dub" is the closing of
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