Digestive System Organs Involved

Mouth n Oral Cavity n Food enters – Ingested n Roof, Walls, Floor Mucous Membrane n Physical & Chemical Breakdown of food

Teeth n Physical Breakdown of Food n Mastication n 2 years old – 20 n 17 to 24 – 32 n 4 Types Incisors Canines Premolars Molars

Tongue n Muscle Moves food around in mouth Bolus n Frenulum Connects tongue to floor n Sensory n Small Elevations Papillae –Salt –Sour –Sweet –Bitter

Salivary Glands n Produce Saliva n Chemical Breakdown Salivary Amylase Carbohydrates n 3 Pair

Pharynx n Tube n Smooth muscle n Mucous Membrane n Back of mouth Connects with Respiratory

Esophagus n Tube n Smooth Muscle n Connects Pharynx to Stomach n About 25 cm long

Know these Parts n Nasopharynx n Esophagus n Tongue n Molars n Parotid Salivary Gland n Oropharynx n Epiglottis n Laryngopharynx n Submandibular Salivary Gland n Sublingual Salivary Gland n Incisors

Know these terms n Ingestion n Digestion n Physical Breakdown n Chemical Breakdown n Chyme n Bolus n Mastication n Peristalsis n Salivary Amylase n HCl

STOMACH n Smooth Muscle Mechanical Breakdown –Peristalsis n Gastric Glands Chemical Breakdown –Hydrochloric Acid & Enzymes n Chyme

LIVER n Under Diaphragm n Largest Gland n Produces Bile Emulsifies Fat Mechanical

GALL BLADDER n Under Liver n Stores Bile Fat in Duodenum Triggers hormone Cholecystokinin CCK

PANCREAS n Behind Stomach n C Shaped n Produces Pancreatic Juice Most Important –Digests ALL 3 foods Insulin –Blood Stream

SMALL INTESTINE n Twisted 7m long n Smooth Muscle n Intestinal Glands Digests Food n Villi Increase Surface Area Nutrients Diffuse into Blood

Parts n Duodenum Right after stomach Pancreas & Liver Dump n Jejunum Most Digestion n Ileum Empties into Large Intestine

LARGE INTESTINE n Chyme to Fecal Matter n Water & Salts Reabsorbed n Bacteria Breakdown Cellulose Produce Vitamin K Some B Vitamins

n ASCENDING n TRANSVERSE n DESCENDING n SIGMOID n RECTUM

APPENDIX n Start Distal Ascending Colon n Twisted n Great spot for bacterial growth