mention the role of pepin, willi, saliva, in digestion
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1.role of pepsin is to convert proteins to peptides.
2.role of saliva:
it contain an enzyme named amylase which converts starch to maltose.
It moistens and kills some pathogens in the food and converts the food to a small ball called bolus
3. role of villi:
these are minute projections which absorbs the digested food and it contains blood capillaries and pass it to the blood
2.role of saliva:
it contain an enzyme named amylase which converts starch to maltose.
It moistens and kills some pathogens in the food and converts the food to a small ball called bolus
3. role of villi:
these are minute projections which absorbs the digested food and it contains blood capillaries and pass it to the blood
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Gastric juice is secreted by the inner lining of the stomach. it is colourless highly acidic liquid containing water,some salt, acid and and an enzyme called pepsin. the acid serves two functions:
It kills any germs which may have entered along with the food .
it activates pepsin to act on proteins. Pepsin is first secreted as pepsinogen which is then changed to pepsin by the acid.
The inner lining of the ileum is produced into a great number of tiny finger like projections called villi. the Villi enormously increase the inner surface area of the intestine( nearly 8 times that of the outer body surface)which facilitates the absorption of digested food. between the Villi are small holes through which the intestinal juice secreted by its glandular cells is poured into the lumen of the intestine. each Villus is covered by a single cell thick epithelium. Inside the villus contains an artery or vein,interconnecting blood capillaries and the lymph vessel called lacteal.
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It kills any germs which may have entered along with the food .
it activates pepsin to act on proteins. Pepsin is first secreted as pepsinogen which is then changed to pepsin by the acid.
The inner lining of the ileum is produced into a great number of tiny finger like projections called villi. the Villi enormously increase the inner surface area of the intestine( nearly 8 times that of the outer body surface)which facilitates the absorption of digested food. between the Villi are small holes through which the intestinal juice secreted by its glandular cells is poured into the lumen of the intestine. each Villus is covered by a single cell thick epithelium. Inside the villus contains an artery or vein,interconnecting blood capillaries and the lymph vessel called lacteal.
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