Question

Question 27
Read the following passage carefully and answer the questions that follows it.

Bile juice is stored in a sac called the gall bladder, located near its organ of secretion that is the liver. The gall bladder releases the bile juice into the small intestine whenever food reaches there. Though bile juice is devoid of any digestive enzymes, it is required for the digestion of fats. The fats cannot be digested easily because they are insoluble in water and are present as large globules. Bile juice breaks down big fat droplets into smaller droplets. These are then easily digested by the enzymes released by the pancreas.

(a) Which organ secretes the bile juice?

(b) Why is digestion of fats difficult as compared to that of other nutrients?

(c) How does bile juice help in digestion of fat?

(d) Where is the digestion of fat completed?

(e) Does bile juice digest fat completely?

Answer 1

Part (a): Bile secretion:

1. Liver secretes the bile juice which remains stored in the gall bladder.

Part (b): Difficulty to digest fat:

1. Fat is insoluble in water which makes it difficult to digest like the other nutrients.
   

2. The absorption of fat after digestion only occurs with the formation of micelles.
   

Part (c): Digestion of bile juice:

1. Breaks down big fat droplets into smaller droplets.This process is called emulsification, wherein the macromolecule of fat is flattened thereby increasing the surface area for the enzyme to act easily on it.
   

Part (d): Complete digestion of fat:

1. Small intestine is the structure of the digestive system where complete digestion of fat occurs.

Part (e): Bile juice on fats​:

1. Bile juice does not completely digest the fat, it only emulsifies it.
   
2. Emulsification of fat is the breaking down of the larger fat globules into smaller molecules.
   
3. The final digestion occurs in the presence of lipase enzyme.