Ontario Grade 11 Biology Practice Exam 2025 – Complete Study Resource

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What is the primary function of bile in digestion?

To break down carbohydrates

To emulsify fats

The primary function of bile in digestion is to emulsify fats. Bile, which is produced by the liver and stored in the gallbladder, contains bile salts that facilitate the breakdown of large fat globules into smaller droplets. This process, known as emulsification, increases the surface area of fats, making them more accessible to digestive enzymes, such as lipase, which can further break down the fats into fatty acids and glycerol. Emulsification is critical for the efficient digestion and absorption of dietary fats in the small intestine.

While bile does perform other functions, such as aiding in the neutralization of stomach acids when it enters the small intestine, its most crucial role in digestion pertains to fat emulsification, enabling the body to utilize dietary fats effectively.

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To digest proteins

To neutralize acids

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