Salivary amylase is the enzyme that begins the digestion of carbohydrates in the mouth.

Villi increase the surface area of the small intestine, enhancing the absorption of nutrients.

Gastric acid activates digestive enzymes, particularly pepsinogen to pepsin, and helps in protein digestion.

Gastric juice contains hydrochloric acid and pepsin, which are essential for the digestion of proteins.

The primary function of the small intestine is the absorption of nutrients from digested food.

The small intestine is the primary site for the absorption of nutrients from digested food.

The stomach is the primary site of protein digestion, where pepsin begins the breakdown of proteins.

Amylase is the enzyme that breaks down carbohydrates into simpler sugars in the mouth.

Trypsin is a pancreatic enzyme that helps in the digestion of proteins in the small intestine.

Trypsin is a proteolytic enzyme secreted by the pancreas that digests proteins in the small intestine.

The stomach primarily absorbs water and alcohol, while other nutrients are absorbed in the small intestine.

Both amylase and trypsin are enzymes secreted by the pancreas to aid in digestion.

The liver does not directly digest proteins; it produces bile and performs other functions.

The small intestine is the primary site for the absorption of nutrients due to its large surface area and presence of villi.

All of the above structures (villi, microvilli, and plicae circulares) increase the surface area for absorption in the small intestine.

Vitamin B12 is primarily absorbed in the ileum of the small intestine.