Difficulty: Easy

Average Score: 82%

What is the function of sodium bicarbonate released by the pancreas?

Rationale

Sodium bicarbonate neutralizes the acidity of chyme.

Sodium bicarbonate, secreted by the pancreas into the small intestine, plays a critical role in neutralizing the acidic chyme that arrives from the stomach. This neutralization creates a more alkaline environment, which is essential for the proper functioning of digestive enzymes that operate optimally at a higher pH.

A (Sodium bicarbonate neutralizes the acidity of chyme.) CORRECT

This choice accurately describes the primary function of sodium bicarbonate. By neutralizing gastric acid, it protects the intestinal lining and facilitates effective digestion by creating conditions suitable for enzymatic activity.

B (Sodium bicarbonate stimulates the protease that digests carbonates.) YOUR ANSWER

This option is incorrect because sodium bicarbonate does not stimulate proteases; rather, it acts primarily as a buffering agent. Proteases are enzymes that break down proteins, and their activity is not directly influenced by sodium bicarbonate in the context of carbonates.

C (Sodium bicarbonate inhibits peristalsis.) YOUR ANSWER

This choice is misleading as sodium bicarbonate does not inhibit peristalsis. Peristalsis is the rhythmic contraction of muscles in the digestive tract that facilitates the movement of chyme. Sodium bicarbonate's role is focused on pH regulation rather than influencing muscular contractions.

D (Sodium bicarbonate stimulates the protease.) YOUR ANSWER

This statement is incorrect because sodium bicarbonate does not stimulate the production or activity of proteases. Instead, it serves to neutralize acidity, which indirectly supports enzyme activity but does not directly stimulate protease enzymes.

Conclusion

Sodium bicarbonate released by the pancreas is essential for neutralizing the acidity of chyme, ensuring a suitable environment for digestive enzymes to function effectively. Misunderstandings about its role can arise, but it is crucial to recognize that its primary function is maintaining pH balance, not directly stimulating digestive enzymes or affecting muscle contractions within the digestive tract.

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