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Digestion and Absorption

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Biology

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CBSE Gujarat Board Haryana Board

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Class 10 Class 12
 Describe the histology of alimentary canal of man.

The wall of alimentary canal from oesophagus to rectum possesses four layers namely serosa, muscularis, sub-mucosa and mucosa.

i. Serosa is the outermost layer and is made up of a thin mesothelium  or the epithelium of visceral organs and has some aconnective tissues.

ii. Muscularis is formed by smooth muscles usually arranged into an inner circular and an outer longitudinal layer. An oblique muscle layer
may be present in some regions.

iii. The submucosal layer is formed of loose connective  tissues containing nerves, blood and lymph vessels. It is highly vascular, dense connective tissue. In duodenum, glands are also present in

iv. Mucosa is the innermost lining. This layer forms irregular folds (rugae) in the stomach and small finger-like foldings called villi in the small intestine

 

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Name the fat soluble vitamins.

Vit A, D, E and  are fat soluble vitamins.
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What is Diphyodont ?

Diphyodont is the condition of having two set of teeth during the life of an organism. For example : humans are diphyodont as they have two set of teeth namely temporary milk or deciduous teeth which are replaced by permanent or adult teeth. 

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What is the function of enamel in digestion?

The enamel helps in the mastication of food.
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What are Sanguivorous animals ?

The animals which suck blood e.g. leech, vampire bat, female mosquito etc.
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What is the order of arrangement of teeth in each half of the upper and lower jaw ?

The order of arrangement of teeth in each half of the upper and lower jaw is I,C,PM,M.  I (incisors), C (cannine), PM (premolars), M (molars).
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