Question

In rabbit the colour of bile juice is
A. Colourless due to the presence of sodium and potassium taurocholate
B. Green due to the accumulation of biliverdin
C. Red due to the accumulation of haemoglobin
D. Yellow due to the presence of bilirubin

Answer 1

Hint: The rabbit also belongs to the class mammals so it has a digestive gland called liver which also secrete the same enzymes and ions just like a human. It has bile juice which is coloured due to the presence of bile secretion.

Complete answer:
BILE JUICE:
Hepatocyte cells Or the liver produces bile-juice and it is stored in the gall-bladder. BileJuice does not contain any type of digestive enzyme, it is not called a true digestive juice.
Composition of bile: Organic constituents are (H2O 98%), bile salt, bile pigment, cholesterol, Lecithin, inorganic constituents Na+, K+ etc. The daily secretion is 500 ml and pH lies between -7.4 to 7.6.
The content of H2O is 98%. Bile-pigments are the excretory substances of the liver.

Bile contains two types of salts-
Inorganic- salts- Bile-juice contains NaCl, Na, CO, NaHCO, etc in it. Inorganic salts neutralize the acidity of the food and make the medium basic.
Organic salts- Organic salts like Na-glycocholate and Na-taurocholate are found in bile juice. The main function of these salts is the emulsification of fats because pancreatic lipase can act only on emulsified fats. Bile salts also help in the absorption of fats and fat-soluble vitamins (A, D, E, K) bile salts combine with fats cholesterol, phospholipid (lecithin) and these vitamins to form compounds called micelles.
Also, bile pigments like bilirubin and biliverdin are excretory products.
In the case of rabbit’s, the accumulation of biliverdin causes the dark green alkaline fluid colour of bile juice.

Hence, the correct answer is option (B).

Note: Just like humans, all mammals have the same type and constituents of bile juice so due to the accumulation of biliverdin pigments the bile juice coloured as dark green and presence of Na+K+ is indicated that juice is alkaline.