Functions Of Saliva

Functions Of Saliva

Question 1. Enumerate any four functions of saliva. Describe the nerve supply to salivary gland and regulation of salivary secretion.
Answer:

Nerve supply to salivary glands:

Salivary glands receive efferent nerve fibers from both parasympathetic and sympathetic divisions of autonomic nervous system.

1. Parasympathetic nerve supply:

1. To parotid gland.

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Postganglionic fibers pass through auriculo temporal nerve to supply the gland.

2. To submandibular and sublingual gland.

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2. Sympathetic nerve supply:

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Around middle meningeal artery to supply parotid gland.

Around facial artery to supply submandibular and sublingual gland.

Saliva composition and function

Question 2. Describe the mechanism of gastric secretion.
Answer:

Mechanism of gastric secretion:

1. Secretion of pepsinogen:

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2. Secretion of hydrochloric acid:

• According to davenport theory, it is an active process occurring in parietal cells.
• In parietal cells carbon dioxide is derived from.

1. Blood

2. Metobolic activites of the cell.

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Co2 combines with water to form carbonic acid in presence of carbonic anhydrase enzyme.

Carbonic acid splits into [H₂CO₃→ H‾+HCO₃‾]

Salivary amylase function

1. Hydrogen ion- pumped into cnaliculi.

2. Bicarbonate ion.

Bicarbonate enters the blood and combines with sodium ion of sodium chloride and form sodium bicarbonate.

HCO₃‾ + Na+ →→ NaHCO₃

Hydrogen ion combines with chloride ion to form hydrogen chloride. H+ CT-→HCI

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