ICSE Class 7 Answered
what is the length of large instane ?
how is sailvary glands work?
4 advantages and dis advantages of sailva.
Asked by P VISHNU | 07 Nov, 2015, 01:55: PM
Expert Answer
(i) Length of large intestine- The large intestine (colon) is about 5 feet long and about 3 inches in diameter.
(ii) The salivary glands are responsible for the production of saliva and mucus. Saliva is a clear, serous fluid composed of water and proteins.The parotid glands produce saliva, the submandibular glands produce a mixed fluid that is mostly saliva and the sublingual glands produce a mixed fluid which is mucus. The salivary glands become stimulated when we chew food as well as through smell and during the eating process.
(iii) Advantages of saliva
(a)Dissolves substance in food to make them more accessible to taste buds.
(b)provides a defensive barrier against bacteria, fungi and viruses.
There are no disadvantages of saliva secretion but salivary glands does undergo some problems like dry mouth, tumour inside the glands, infections, blockages etc.
Answered by Sivanand Patnaik | 09 Nov, 2015, 08:04: AM
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