Digestive System Chapter 14.

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Presentation transcript:

Digestive System Chapter 14

Digestive overview primary function is digestion of food & absorption of nutrients

Anatomy of GI tract the walls of the tract composed of 4 layers of tissue 1. mucosa 2. submucosa

Anatomy of GI tract 3. muscularis

Anatomy of GI tract 4. serosa

Anatomy of GI tract

Muscularis of stomach

Movement of GI tract peristalsis segmentation

peristalsis segmentation

Digestion is a 4 part process Ingestion Digestion Absorption Elimination

Ingestion food is taken into body by mouth

Digestion physical & chemical breakdown of food into absorbable molecules stomach small intestine pancreas liver

Indigestion/heartburn

Absorption mostly occurs in small intestine villi, microvilli

Small intestine

What causes gas & the toots?

Elimination Elimination: indigestibles are discarded as waste products

A few words about poop Composition, on average is about . . .

Obesity (epidemic??)

Obesity, continued Hormone leptin

Health effects of obesity Body has a harder time maintaining homeostasis & some effects are:

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