Which primary function is responsible for breaking down food into smaller molecules?

Which primary function is responsible for breaking down food into smaller molecules?

• A. Ingestion
• B. Secretion
• C. Digestion
• D. Elimination

Answer: (C)

Digestion is the process that breaks down food into smaller molecules. It involves both mechanical actions, like chewing and stomach churning, and chemical actions, where enzymes and acids break macronutrients into absorbable units such as sugars, amino acids, and fatty acids. This transformation is what allows nutrients to be absorbed through the intestinal lining and then used by the body's cells. Ingestion is simply taking food into the mouth, secretion refers to releasing digestive fluids, and elimination is the removal of indigestible waste. So digestion is the function that turns food into the small molecules our bodies can use.

Digestion is the process that breaks down food into smaller molecules. It involves both mechanical actions, like chewing and stomach churning, and chemical actions, where enzymes and acids break macronutrients into absorbable units such as sugars, amino acids, and fatty acids. This transformation is what allows nutrients to be absorbed through the intestinal lining and then used by the body's cells. Ingestion is simply taking food into the mouth, secretion refers to releasing digestive fluids, and elimination is the removal of indigestible waste. So digestion is the function that turns food into the small molecules our bodies can use.