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Explain Protective and Excretory Function
Protective function: Large quantity of mucin is secreted by gastric glands. Mucin lubricates the food bolus (a mass of chewed food) and also gives a protective layer over the gastric mucosa.
Excretory function: Certain toxins, heavy metals like lead and some alkaloids are excreted through the gastric juice.
Explain Organs of the Respiratory System The respiratory system consists of various organs. They form a clear pathway for the air to enter and leave the lungs. The body needs a
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