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Explain Gut secretions - External Defence Mechanism
From the saliva and respiratory tract, bacteria reach the gut, here they are killed by the hydrochloric acid and proteolytic enzymes of the gastric juices. They are capable of killing the microbes. If they further escape and reach the large intestine, they are attacked by the gut microbes, which secrete antibiotics that kill many pathogenic bacteria. Note: Hepatitis A virus survives gastric juice.
Primate Heritage: Man belongs to a group of animals called mammals which are different from other animal groups in possessing hair, and milk producing mammary glands, among
How soap helps water in cleaning Prepare two greasy cloths by smearing kitchen fat or vaseline on cloths. Wash one sample in warm water without soap. Wash the other sample in w
Microwave Processing Factors Frequency: There are two available frequencies for microwave heating - 915 and 2,450MHz; the frequency affects the depth of penetration into
How do we represent atoms without drawing all the subatomic particles? Atoms can be represented by their chemical symbols. For example, H is hydrogen, He is helium, etc. All t
An aneroid barometer The corrugated rubber tube from a gas mask, or a cycle grip, can be used to make a model aneroid barometer. No huge accuracy is to be expected due to the m
Ascorbic Acid (vitamin C) Although the antiscorbptic (preventing the disease scurvy) effects of citrus hits was known for a long time, the first important step towards its
Explain the Types of Artificial Kidney Dialysis Two types of artificial kidney dialysis are used clinically - Hemodialysis and Peritoneal dialysis
Explain the Transport of Carbon Dioxide in solution Carbon dioxide is amore soluble gas than oxygen. Its amount in solution is proportional to the tension. At a tension of 40
Explain Non-protein Functions of Amino Acids The non-protein functions of amino acids are presented in the following section. It is interesting to note that the non-protein fun
Niacin (vitamin B3) Though niacin or nicotinic acid has been known to the organic chemists since 1867 and Funk isolated it from yeast and rice polishing in order to identif
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