Tag: biology

Saliva contains bicarbonate ions, which act as a buffer to neutralize acids produced by bacteria or present in food, helping to maintain a neutral pH in the mouth and protect tooth enamel.

• Saliva secreted by salivary glands doesn't give safety against dental caries.
  
• Dental carries take place due to deposition of food particles on teeth and subsequent bacterial decay.
  
• So, the correct option is 'Give safely against dental carries'.

The pancreas is a heterocrine gland containing both endocrine tissue (islets of Langerhans secreting insulin and glucagon) and exocrine tissue (acinar cells secreting digestive enzymes into ducts).

Polytene chromosomes found in the salivary glands of dipteran insects undergo somatic pairing, where homologous chromosomes closely pair up side by side throughout their length.

Humans have three pairs of major salivary glands, not six pairs. The other statements are correct: human saliva is slightly acidic to neutral (though often cited around pH 6.8, effectively close to neutral or slightly alkaline depending on flow rate, but the gland count of six pairs total, meaning three on each side, makes option C false as it states six pairs meaning twelve pairs total).

Salivary glands are characteristic of mammals. Frogs and other amphibians lack true salivary glands, although they have glands that secrete mucus to moisten food.

Merocrine secretion is a process where cells release products via exocytosis without losing any part of the cell itself. Both salivary glands and the exocrine pancreas use this mechanism.

In human, 3.pairs of salivary glands are present. They are sublingual , parotid  and submaxillary .

The parotid glands are the largest of the salivary glands and are located just below and in front of each ear.

Lysozyme is an antimicrobial enzyme that breaks down bacterial cell walls. It is found in various bodily secretions, including both saliva and tears, as a primary defense mechanism.