Which one of the following enzymes carries out the initial step in the digestion of milk in humans? [2011]a)Renninb)Pepsinc)Lipased)TrypsinCorrect answer is option 'B'. Can you explain this answer?

Question

Answer

Rennin ,the initial milk digesting protein is present only in infants .In adults this enzyme is absent,so the milk digesting function is done by pepsin itself.so,op B.

Answer

----)) Rennin's primary function is to coagulate the milk. The stomachs of infants are not properly developed. That is why they cannot digest solid food in the first months of life. Also, because the digestive tract is very sensible, it might eliminate the milk young children usually ingest.

•Therefore, its very important that milk stays in the stomach and within the body as much as possible. This doesnt happen, when the milk is in its liquid form, but when its curdled. Thats the reason, why rennin is that essential for babies.

Answer

Initial step in digestion of milk in humans

The digestion of milk in humans involves the breakdown of lactose, a type of sugar found in milk. The initial step in this process is carried out by an enzyme called pepsin.

Pepsin

Pepsin is a proteolytic enzyme that breaks down proteins into smaller peptides. It is produced in the stomach by chief cells and is activated by hydrochloric acid, which also denatures the proteins in food.

Role of pepsin in milk digestion

In the case of milk digestion, pepsin specifically acts on the protein casein, which makes up about 80% of the protein content in milk. Pepsin cleaves casein into smaller peptides, which are then further broken down by other enzymes such as trypsin and chymotrypsin in the small intestine.

Other enzymes involved in milk digestion

In addition to pepsin, other enzymes play a role in the digestion of milk. These include:

- Rennin: an enzyme produced in the stomach of infants that helps to coagulate milk by converting soluble casein into insoluble casein curds. In adults, rennin production decreases and is replaced by pepsin.
- Lipase: an enzyme that breaks down fats into fatty acids and glycerol. Lipase is produced in the pancreas and is important for the digestion of the fat content in milk.
- Trypsin and chymotrypsin: enzymes produced in the pancreas that further break down the peptides produced by pepsin into smaller peptides and amino acids.

Conclusion

In conclusion, the initial step in the digestion of milk in humans is carried out by the enzyme pepsin, which breaks down the protein casein into smaller peptides. Other enzymes such as rennin, lipase, trypsin, and chymotrypsin also play important roles in the digestion of milk.

Answer

Pepsin in adults and rennin in infants

Answer

Rennin enzyme used to digest milk only in infants and it is absent in adults so in the absence of rennin enzyme this work is done by pepsin in adults.

Answer

In humans the milk protein digesting enzyme present in stomach is pepsin.pepsin acts on water soluble caseinogen (milk protein) to form soluble casein.this combines with calcium salts to form insoluble calcium paracaseinate which gets readily digested enzymatically..renin is present in small amounts in infants but not in adults.

Answer

Rennin digest milk
pepsin digest proteins

Answer

...?

Answer

Correct answer is pepsin ,,,as milk contains protein ,, pepsin is an enjyme to digest protein

Answer

But  in question it is asked initial step and basically initial is referred to the initial days of a person which is an infant so the answer should be rennin. Please  do look into this question.

Answer

It's wrong Key
Renin is the initial step for digestion of milk because question say in humans , obviously in humans initially is RENNIN present but not pepsin

Answer

Rennin because milk digestion is mentioned
if it was protein digestion then the answer would be pepsin

Answer

Rennin is present only in children , it is absent in adults.

While in adults digestion of milk at all steps is carried out by pepsin.

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