NEET Zoology Digestion and Absorption Questions Solved

AIIMS - 2006

Which one of the following pairs of the kind of cells and their secretion is correctly matched ?

(a) Oxyntic cells --- a secretion with pH between 2.0 and 3.0

(b) Alpha cells of islets of Langerhans ---- secretion that decreases blood sugar level

(c) Kupffer cells --- a digestive enzyme that hydrolyses nucleic acids

(d) Sebaceous glands --- a secretion that evaporates for cooling

Audio Explanation:

(a) Oxyntic (or parietal) cell is present in the wall of the stomach that produce HCl which forms the part of gastric juice. Oxyntic cell also produce intrinsic factor which is involved in the absorption of vitamin B12 in the small intestine. The pH of gastric acid is 2-3 in the stomach of the lumen. the acidity being maintained by the proton pump, a H+/K+ ATPase.

Alpha cell of islets of langerhans secret glucagon hormone which raises blood glucose level by stimulating liver to convert glycogen to glucose and by simulating the conversion of fatty acids and amino acids to glucose.

Kupffer cells are specialised macrophages that disposes of old blood cells and particulate matter. Kupffer cells named after Karl Wilhem Von Kupffer, are found in the bloodstreams and in the liver, attached to the walls of te sinusoids.

Sebaceous gland is a simple or branched glands in the skin that secret an oily substance, sebum which is fatty midley antiseptic material that protects, lubricates and waterproofs the skin and hair and help prevent dessication.

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