2 07 Remember the structures of the digestive

2. 07 Remember 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 2

Structures of the digestive system Digestive system q Also known as: n n n Alimentary Canal Digestive Tract Gastrointestinal Tract q q n n Upper GI Lower GI Approximately 30 FEET in length from mouth to anus 2. 07 Remember the structures of the digestive system 3

Structures of the digestive system Primary structures q q q Mouth Esophagus Stomach Small intestines Large intestines Accessory (assistive) structures q q q Tongue Teeth Salivary glands Pancreas Liver Gall bladder 2. 07 Remember the structures of the digestive system 4

Structures of the digestive system Mouth n (buccal cavity) q q q Tongue Teeth Salivary Glands Palate Uvula 2. 07 Remember the structures of the digestive system 5

Structures of the digestive system Tongue q q q Attached to floor of mouth Made of skeletal muscle attached to four bones Taste buds (Papillae) on the surface n Sweet , Sour n Bitter, Salty n n Also sensitive to Cold, heat and pressure 2. 07 Remember the structures of the digestive system 6

Structures of the digestive system Teeth q Primary (deciduous) n q 20 “baby teeth” (6 mos-2 yrs) Secondary (permanent) 32 “adult teeth”, (6 YRS) Wisdom teeth (3 rd molars) usually appear between 17 -25 yrs. old n 2. 07 Remember the structures of the digestive system 7

Types of Teeth n n Incisors- sharp edges for BITING Canines- pointed for TEARING Molars- ridges for CRUSHING & GRINDING Wisdom teeth

Structures of the digestive system n Salivary glands q Parotid gland- Largest salivary gland, found on both side of the face, in front and below the ears. Secretes salivary amylase q q Submandibular gland-approx. size of a walnut, secretes mucin & ptyalin salivary amylase Sublingual gland- smallest of the 3, found under the sides of the tongue, secretes mainly mucus 9

Structures of the digestive system Palate q q Hard- roof of mouth Soft- back of hard palate Uvula q Flap of skin hanging in the middle of soft palate. Prevents food from entering nasal cavity when swallowing 10

Structures of the digestive system n Pharynx (throat) q q q Nasopharynx Oropharynx Hypopharynx 2. 07 Remember the structures of the digestive system 11

Structures of the digestive system n Esophagus Muscular tube, 10” long q Connects the pharynx and stomach Esophageal wall layers – Mucosa – Submucosa – Muscular – External serous q n 2. 07 Remember the structures of the digestive system 12

Structures of the digestive system n Stomach n n q q q Upper left quadrant of the abdominal cavity, 3 areas: Fundus Body Pylorus Cardiac Sphincter- @ EG junction Pyloric Sphincter- @ pyloris /duodenum Rugae- folds of tissue (like an accordian) (increases surface area) 13

Structures of the digestive system n Small intestines q Duodenum n n q Jejunum n n q First segment 12” long Second segment 8’ long Ileum n n Third segment 10 -12’ long 14

Structures of the digestive system Accessories… n Pancreas q q n Liver q q n Secretes digestive enzymes Located behind stomach Largest organ of body Connects to gall bladder and small intestine by ducts Gall Bladder q Stores and concentrates bile until needed by body 15

Structures of the digestive system n Large intestines (Colon) q q q q Approximately 2” in diameter 5’ long 3 SECTIONS: ASCENDING (Hepatic Flexure) TRANSVERSE (Splenic Flexure) DESCENDING/SIGMOID Anus / Rectum 16

Structures of the digestive system r u o y k … c e e g Ch owled kn 2. 07 Remember the structures of the digestive system 17

Essential Question What are the structures of the digestive system? 2. 07 Remember the structures of the digestive system 18