Digestive System

Process where carbs proteins and fat molecules are broken down into small enough products to be absorbed into blood & cells

Broken into smaller pieces - increase SA and make chemical digestion more effective

Uses enzymes to break down complex molecules into simpler ones

Tube that runs from mouth to anus where nutrients are absorbed

Ingestion (intake of food), salivary glands produce salivary amylase - break down carbs , tongue rolls food into bolus

Double layer of circular muscle and longitudinal, 25m long, connects pharynx to stomach

Wave of construction behind and in front of the bolus to push food down

Mechanical digestion (constriction of stomach walls, churning - oblique circular and longitudinal muscles), chemical digestion (enzymes in gastric juice), Pepsinogen converted to pepsin which breaks down proteins, living called mucosa secretes gastric juices

Base of the stomach, stops stomach contents from entering digestive track

Nutrients absorbed, large surface area - (extremely long, folds, villi & microvilli))

Contain lymph capillaries (lacteals) surrounded by blood capillaries

Helps in mechanical digestion, bile salts break into tiny droplets, makes easier for lipase to chemically break down fats, produced in liver stored in gall bladder

secretes mucus, contain bacteria to break down compounds, absorbs water