2.07 Remember the structures of the digestive system

What are the structures of the digestive system? Essential Question What are the structures of the digestive system? 2.07 Remember the structures of the digestive system

Structures of the digestive system Also known as: *Alimentary Canal Digestive Tract Gastrointestinal Tract Upper GI Lower GI Approximately 30’ in length from mouth to anus 2.07 Remember the structures of the digestive system

Structures of the digestive system *Primary structures Mouth *Esophagus Stomach Small intestines Large intestines *Accessory structures Tongue Teeth Salivary glands Pancreas Liver *Gall bladder 2.07 Remember the structures of the digestive system

Structures of the digestive system *Mouth (*buccal cavity) Tongue Teeth Salivary Glands *Palate Uvula 2.07 Remember the structures of the digestive system

Structures of the digestive system Tongue Attached to floor of mouth Made of skeletal muscle attached to four bones Taste buds on the surface Sweet Sour Bitter Salty 2.07 Remember the structures of the digestive system

Structures of the digestive system Teeth Primary (deciduous) 20 “baby teeth” Secondary (permanent) 32 “adult teeth” Did you know??? Canine teeth are also known as cuspids and eye teeth. 2.07 Remember the structures of the digestive system

Structures of the digestive system Salivary glands Parotid gland Largest salivary gland Submandibular gland Near the angle of the lower jaw Sublingual gland Under the tongue 2.07 Remember the structures of the digestive system

Structures of the digestive system Palate-separates the mouth from the nasopharynx Hard Soft Uvula Flap of skin hanging in the back of the throat; prevents food from entering the nasal cavity 2.07 Remember the structures of the digestive system

Structures of the digestive system Pharynx (throat) Nasopharynx Oropharynx Hypopharynx 2.07 Remember the structures of the digestive system

Structures of the digestive system Esophagus Muscular tube, 10” long Connects the pharynx and stomach Esophageal wall layers Mucosa Submucosa Muscular External serous 2.07 Remember the structures of the digestive system

Structures of the digestive system Stomach Upper left quadrant of the of the abdominal cavity Fundus (top) Body (middle) Pylorus (lower) Cardiac Sphincter Between esophagus and stomach Pyloric Sphincter Between stomach and small intestines Rugae Folds of gastric mucosa inside the stomach

Structures of the digestive system Small intestines Duodenum First segment 12” long Receives bile from the gallbladder and liver Jejunum Second segment 8’ long Ileum Third segment 10-12’ long 2.07 Remember the structures of the digestive system

Structures of the digestive system Accessories… Pancreas Feather shaped organ Secretes digestive enzymes to break down food Located behind stomach Liver Largest organ of body Connects to gall bladder and small intestine by ducts Gall Bladder Small muscular sac, located in the right upper quadrant of the abdomen Stores and concentrates bile until needed by body

Structures of the digestive system *Large intestines Approximately 2” in diameter 5’ long *Receives chyme (thick, creamy liquid food) from the ileum 2.07 Remember the structures of the digestive system

Structures of the digestive system *Large intestines *Cecum-pouch at the beginning of the large intestines; located in the abdominal cavity Ascending colon-1st section; located in abdominal cavity Transverse colon-middle; located in abdominal cavity *Descending colon/sidmoid colon-extends into the rectum Anus-the EXTERNAL opening of the large intestines

Structures of the digestive system Check your knowledge… 2.07 Remember the structures of the digestive system

What are the structures of the digestive system? Essential Question What are the structures of the digestive system? 2.07 Remember the structures of the digestive system