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Consider the below given statements:
(i) The pH of saliva maintained between 6.85-7.4 is due to the presence of chloride and phosphate ions which acts as a buffer.
(ii) The enzyme present in saliva which initiates the breakdown of carbohydrates is known as Ptyalin or Salivary amylase.
(iii) Saliva is essentially 70% of water and remaining are complex mixtures of ions,glycoproteins etc.
Only (iii) is correct.
Option (i) and (ii) are correct.
Option (i),(ii) and (iii) are correct.
Only option (ii) is correct.
Answers (1)
The bicarbonate and phosphate ions contributes as a buffer and therefore results in pH maintained as 6.85-7.4 of saliva.Ptyalin results in breakdown of glucose to maltose in buccal cavity itself considered as first step of digestion. Saliva composition has 95.5 % water content in it.
Option 4 is the correct answer.
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