Question

Crypts of Lieberkuhn involved in
A. Secretion of succus entericus
B. Secretion of rennin
C. Secretion of ptyalin
D. Digestion of food

Answer 1

Hint: The cells of these glands secrete the intestinal juice in the duodenal region of the small intestine which is alkaline.

Complete answer:
Crypts of Lieberkuhn are also called succus entericus. They are the clear to pale yellow watery secretions from the glands lining the walls of the small intestine.

Additional information
- The crypts of Lieberkuhn are the tubular glands that lie between the finger-like projections of the small intestine called villi.
- The cells of these glands are called paneth cells, which secrete antibacterial lysozyme.
- These glands are named after the German anatomist J. N. Lieberkuhn.
- The function of succus entericus is to complete the process begun by the pancreatic juice.
- In pancreatic juice, enzyme trypsin is present in its inactive form called trypsinogen.
- The inactive trypsinogen is activated by the intestinal entericus in intestinal juice.
- Trypsin after its activation can activate other protease enzymes.
- Succus entericus also contains hormones, digestive enzymes, mucus, hydrochloric acid to neutralize the substances, and erepsin to complete protein digestion by breaking polypeptide chains into amino acids

So, the correct answer is ‘Secretion of succus entericus’.

Note: The intestinal glands contain adult stem cells which are called intestinal stem cells. These stem cells have been used in the field of stem biology to understand the stem cell niches and to generate the intestinal organoids. The inflammation of crypts is known as cryptis and its severity may lead to crypt abscess. Rennin is an enzyme that is found in the stomach of young mammals. It helps in the curdling of the milk. Ptyalin is an amylase enzyme that is found in the salivary glands of humans. This enzyme helps in the breaking down of the complex sugar molecules into simpler ones.