Pig 01-Digestive System

Nictitating membrane

Protects and lubricates the eye

Vibrissae

Whiskers

Male fetal pig external anatomy

Scrotal swelling

Female fetal pig external anatomy

Genital papilla

Tongue function

Taste and movement of food

Hard palate function

Mechanical digestion

Soft palate function

Blocks food from entering nasal passages during swallowing

Epiglottis function

Covers trachea during swallowing

Pharynx function

Junction between digestive and respiratory systems

3 regions of the pharynx

Nasopharynx, Oropharynx, Laryngopharynx

Esophagus function

Leads food to stomach

Stomach function

Initial protein digestion

What does the stomach secrete?

HCl and pepsin

Rugae

Folds in stomach wall that allow expansion

Cardiac (esophageal) sphincter

Prevents stomach acid from entering esophagus

Pyloric sphincter

Controls passage of chyme into duodenum

Major site of digestion and absorption

Small intestine

Duodenum function

Receives chyme and enzymes/bile

Jejunum function

Main site of nutrient absorption

Ileum function

More absorption and reabsorption

Cecum function

Contains bacteria for cellulose digestion

Spiral colon function

Water and electrolyte reabsorption

Liver functions

Produces bile, detoxification, glycogen storage

Gallbladder function

Stores bile

Pancreas functions

Produces digestive enzymes, sodium bicarbonate, insulin, and glucagon

Spleen function

Filters blood and helps immune system

Salivary glands function

Secrete saliva

Components of saliva

Amylase, mucus, and water

Masseter muscle

Overlies lower jaw

What does bile help digest?

Fats

What does pepsin digest?

Proteins

What does HCl do in the stomach?

Creates acidic environment for digestion

Accessory digestive organs

Salivary glands, liver, gallbladder, pancreas

Digestive tract order

Oral cavity → Pharynx → Esophagus → Stomach → Small intestine → Large intestine → Rectum → Anus