Understanding Bile Juice Functions in Digestion

The question asks about the roles of bile juice in the human digestive system. Let's examine the two statements provided:

Analyzing Statement (A): Bile Juice Alkalinity

Statement (A) claims that bile juice makes the partly digested food coming from the stomach alkaline. Here's why this is true:

• Food enters the small intestine (specifically the duodenum) from the stomach as chyme.
• This chyme is highly acidic due to the hydrochloric acid (HCl) present in the stomach, which is necessary for stomach function.
• Bile juice, produced by the liver and stored in the gallbladder, is released into the duodenum.
• Bile juice is alkaline in nature (contains bicarbonate ions).
• This alkalinity helps to neutralize the acidic chyme coming from the stomach.
• Creating a slightly alkaline environment is essential for the proper functioning of the digestive enzymes present in the small intestine, such as pancreatic enzymes.

Therefore, statement (A) is true.

Analyzing Statement (B): Role in Fat Digestion

Statement (B) suggests that bile juice helps in the digestion of fats. This statement is also true.

• Bile juice does not contain digestive enzymes itself.
• However, it contains substances called bile salts.
• Bile salts perform a crucial function known as emulsification of fats.
• Emulsification means breaking down large fat globules into much smaller droplets.
• This process significantly increases the total surface area of the fats exposed to digestive enzymes, like lipase.
• With a larger surface area, lipase can act more efficiently to break down fats into absorbable components (fatty acids and glycerol).
• So, while bile juice doesn't chemically digest fats, it plays a vital preparatory role that enables efficient fat digestion.

Therefore, statement (B) is true.

Conclusion on Bile Juice Functions

Based on the analysis of both statements:

• Statement (A) is true because bile juice neutralizes stomach acid, making the environment alkaline.
• Statement (B) is true because bile salts emulsify fats, aiding their digestion.

Since both statements (A) and (B) are true, the correct option is the one that reflects this.