1. OPENER
What organs are involved with digestion? What do you already know about how they work?

2. Parotid gland Mouth (oral cavity) Sublingual gland Salivary glands
Tongue
Submandibular
gland
Pharynx
Esophagus
Stomach
Pancreas
(Spleen)
Liver
Gallbladder
Transverse colon
Duodenum
Descending colon
Small
intestine
Jejunum
Ascending colon
Ileum
Cecum
Large
intestine
Sigmoid colon
Rectum
Vermiform appendix
Anus
Anal canal
Figure 23.1

4. Animation Ingestion Food Mechanical digestion Pharynx
• Chewing (mouth)
Esophagus
• Churning (stomach)
Propulsion
• Segmentation
(small intestine)
• Swallowing
(oropharynx)
Chemical
digestion
• Peristalsis
(esophagus,
stomach,
small intestine,
large intestine)
Stomach
Animation
Absorption
Lymph
vessel
Small
intestine
Blood
vessel
Large
intestine
Mainly H2O
Feces
Defecation
Anus
Figure 23.2

5. OPENER
Why is there no “one size fits all” formula for what people should eat?

6. OPENER
Why is obesity a modern epidemic? What do you think is causing it?
Test next week Monday

7. Control of Appetite: Chemical

8. What is going on?
Knowing what you know about hunger controls, do you think this might have anything to do with the obesity problem?
Video