Principles of Human Physiology: Gastrointestinal System

Flashcards based on key terms and definitions from the lecture on the gastrointestinal system.

Saliva

A secretion that aids in digestion and moistens food.

Stomach acid

Hydrochloric acid secreted by parietal cells, aids in digestion.

Pancreatic juice

A secretion that contains digestive enzymes and bicarbonate to neutralize stomach acid.

Bile

A fluid produced by the liver that helps in the digestion of fats.

Gastrin

Hormone that stimulates secretion of gastric acid.

Cephalic phase

The initial phase of gastric secretion triggered by the sight, smell, and taste of food.

Gastric phase

The phase where gastric secretion is stimulated by food in the stomach.

Secretin

Hormone that stimulates the secretion of bicarbonate-rich fluid from the pancreas.

CCK (Cholecystokinin)

Hormone that stimulates gallbladder contraction and bile secretion.

Acinar cells

Cells in the pancreas responsible for producing digestive enzymes.

Duct cells

Cells in the pancreas responsible for secreting bicarbonate-rich fluid.

Chemoreceptors

Sensors that detect changes in chemical composition, such as acidity.

Mechanoreceptors

Sensors that detect mechanical changes such as pressure or stretch.