What are microvilli ? State their functions. 

Microvilli are the evaginations of plasmalemma of intestinal cells. They are the numerous miceoscopic projections produced by the cells lining the villi Microvilli increase the surface area enormously for absorption of food.
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How would the digestion of food be affected if the bile duct is blocked ?


 Bile cannot be passed into duodenum. Thus, fat digestion and its absorption cannot occur. Therefore, fats pass out indigested. It may also lead to the disease jaundice.
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What is the function of oesophageal sphincter ? 

The oesophageal sphincter regulates the opening of the oesophagus into stomach. It checks the regurgitation of food from stomach into oesophagus.
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Define Caecum.

Caecum is the small blind sac that hosts some symbiotic micro-organisms. It is a part of large intestine. 
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If HCl is not secreted what would be the effect on digestion ?

HCl activates Pepsinogen and Prorennin. In the absence of HCl, protein digestion will not take place as the enzyme pesin is not activated.
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