Question

Bile secretion is proportional to concentration of
A. Protein
B. Fat
C. Carbohydrate
D. None of the above

Answer 1

Bile is a dark-green-to-yellowish-brown fluid formation that takes place in the liver and main function of that digestion of lipids in the small intestine. In humans beings are released continuously by the liver and stored and concentrated in the gallbladder. Bile is transferred into the duodenum after eating.

Complete Answer:
- The chemistry of bile contains (97% - 98%) water, 0.7% bile salts, 0.2% bilirubin, 0.51% fats and 200 meq/l inorganic salts.
- In bile two vital pigments are presents that are bilirubin (orange–yellow) and bilirubin oxidised into biliverdin(green). These two pigments mixed then the brown color of feces appeared.
- Bile salt have both characters are hydrophilic on one side and hydrophobic on the other side
- Bile acts as the surfactant and emulsifies the lipids in food.
- Bile production directly depends on the fat. If the concentration of fat in diet is more than bile production also increased.

So, the correct answer is Fat.

Additional information:
- Mechanism of fat emulsification is bile's aggregation around the lipids particles and micelles formation take place.
- Hydrophobic side of bile towards fat and hydrophilic side towards outside.
- Combining bile surface area of lipids increases the action of pancreatic lipase.

Note: Bile increases the absorption of fats as well as fat-soluble substances like the vitamins A, D, E, and K and also bile is the mode of excretion of bilirubin.