Which of the following is an exocrine secretion?a)Oxytocinb)Salivac)Thyroxined)VasopressinCorrect answer is option 'B'. Can you explain this answer?

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UPSC Exam > UPSC Questions > Which of the following is an exocrine secret...

Which of the following is an exocrine secretion?

a)
Oxytocin
b)
Saliva
c)
Thyroxine
d)
Vasopressin

Correct answer is option 'B'. Can you explain this answer?

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Most Upvoted Answer

Which of the following is an exocrine secretion?a)Oxytocinb)Salivac)T...

Concept:

Exocrine glands: The glands which secrete substances on the epithelial surface through the ducts are called exocrine glands. E.g. sweat, salivary, mammary, ceruminous, lacrimal, sebaceous, prostate, and mucous glands.
Endocrine glands: The glands which secrete hormones and other substances directly into the bloodstream are called endocrine glands—Eg. Pituitary, Pineal, Thyroid, Thymus, Gonads, etc.

Solution-

Saliva is an exocrine secretion of the salivary glands.
There are 4 pairs of salivary glands in mammals:
- Infra-orbital glands: Situated below the eye orbit. Ducts of these glands open into the upper jaw near the 2nd molar teeth.
- Parotid-glands: These are the largest salivary glands. Situated below the auditory capsule (ear). Their ducts are called Parotid duct/Stenson's duct that opens in the buccal-vestibule.
- Submaxillary glands: Situated at the junction of the upper and the lower jaw. Their duct, called Wharton's duct, open in the lower jaw just behind the incisor teeth.
- Sublingual glands: These are the smallest salivary glands situated in the lower jaw. Their ducts called Ducts of Rivinus open in the buccopharyngeal cavity on the ventral side of the tongue.

Additional Information

Oxytocin: It is an endocrine gland secretion. It is also known as the birth hormone. It stimulates uterine contraction during the time of childbirth.
Thyroxine: It is an endocrine secretion of the thyroid gland. The thyroid gland requires 120 microgram Iodine per day for the production of thyroxine. It regulates the basal metabolic rate of the body.
Vasopressin: Also called Antidiuretic hormone secreted by the posterior pituitary gland. It mainly acts on the kidney and stimulates the reabsorption of water by the distal convoluted tubules and thereby reduces the loss of water through urine (Diuresis) so-called antidiuretic hormone.

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