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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 direct communication with other parts of the body. The parasites, microbes present are not in the physiological interior of the body. The mucous membranes in these tracts are treated as a part of external defence. These membranes can resist entry of parasites, microbes into tissues.
Mucous traps the microorganism and immobilizes them. How? Mucous, as you may know, is a clear, sticky substance and has glycoprotein and water. The microbes get trapped in this sticky fluid. Let us see what role the mucous has in the body systems and organs.
Explain Brain or Detector - Mechanism of Colour Perception The fibre identification of colour takes place in the brain. If any of these four pre-requisites are not present, the
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