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प्रश्न
How do the salivary glands come to know that there is food in the mouth and it is time to secrete saliva?
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उत्तर
Through the nerves present in the mouth, the brain comes to know that there is food in the mouth. The brain then gives orders to the salivary glands to secret the saliva. Thus when there is food in the mouth, automatic secretion of saliva takes place.
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संबंधित प्रश्न
Define holozoic nutrition. Give one example
Draw a labelled diagram of the human digestive system. With the help of this diagram, describe the process of digestion of food in man (humans).
Which of the following component of our food is digested by an enzyme which is present in saliva as well as in pancreatic juice?
(a) proteins
(b) fat
(c) minerals
(d) carbohydrate
If the teeth are not cleaned regularly, they become covered with a sticky yellowish layer W of food particles and bacteria. Since layer W covers the teeth, the alkaline liquid X secreted by glands Y inside the mouth cannot reach the teeth surface to neutralise the acid formed by the action of organisms Z on sugary food, and hence tooth decay sets in.
(a) What is W known as?
(b) What is (i) X, and (ii) Y?
(c) What are organisms Z?
(d) State one way of removing layer W from the teeth.
How is the liver an important organ in our body?
Write true or false for the below statement. Rewrite the false statements correctly.
Water is absorbed in large intestine
State one difference in nutrition: Holophylic and Holozoic
The process by which the body removes waste is called ______.
(i)______ and (ii)______ form the common bile duct.
Following statements describe animal nutrition. Read the statement and give one word for the statement. Write the terms that describe process.
Breaking of complex food substances into simpler and soluble substances.
