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

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

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

Pepsin is the main enzyme that digests proteins in the acidic environment of the stomach.

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 pancreas produces digestive enzymes that help in the digestion of carbohydrates, proteins, and fats.

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.

The pancreas produces digestive enzymes that help in the digestion of carbohydrates, proteins, and fats.

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.

Saliva contains amylase, which begins the digestion of carbohydrates in the mouth.

The stomach secretes hydrochloric acid, which aids in digestion and creates an acidic environment for enzymes.

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

The liver does not directly digest carbohydrates; it plays roles in detoxification, bile production, and protein synthesis.

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

The large intestine is primarily responsible for the absorption of water and electrolytes.

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

The cardiac sphincter, also known as the lower esophageal sphincter, prevents the backflow of food from the stomach to the esophagus.

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

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

Vitamin B12 is primarily absorbed in the small intestine, specifically in the ileum.