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Physiology

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GIT

Question
8 out of 19
 

All of the following are functions of saliva except



A Acts as lubricant for mastication

B It helps in perception of taste by dissolving

C It helps in digestion of carbohydrates

D It helps in digestion of proteins

Ans. D It helps in digestion of proteins
  1. Saliva contains the digestive enzyme ptyalin (salivary alpha amylase), which has a minor role in starch digestion also contains mucin which is a glycopeptide that lubricates the food About 1.5 liter of saliva is secreted per day an its pH is about 7.0.
  2. It performs a number of functions. It facilitates swallowing, keep the mouth moist, serves ar solvent for molecules that stimulate the taste buds, aids speech by facilitating movements of the lips and tongue, a keep the mouth and teeth clean.
  3. It may also have some antibacterial action. The buffers in saliva help to maintain the oral pH at about 7.0 Q. At this pH the saliva is saturated with calcium, and so that teeth do not loose calcium to the fluids. Q

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