Chapter 29 NUTRITION and DIGESTION

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Chapter 29 NUTRITION and DIGESTION
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Heterotrophs get nutrients in various ways
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Bulk-feeding a python
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4 Main Stages of Food Processing

• Ingestion
• Digestion
• Chemical (enzymatic hydrolysis)
• Mechanical
• Absorption
• Elimination

The Virtual Worm Tour A tube within a tube
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• Evolution of Digestion from uni to multicellular

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• Virtual Pig Dissection

Nutrition Interactive Wonderful! In depth
review of everything discussed!
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What are the basic nutrient groups?

• CARBOHYDRATES
• Digested to monosaccharides
• PROTEINS
• Digested to amino acids
• FATS
• Digested to fatty acids and glycerol

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Nutrition Interactive Wonderful!
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It all begins in the mouth . . .
Only carbs are digested here Saliva contains
amylase
Digestive System simple overview
Amylase animation
More specific digestive system video
Nutrition Interactive Wonderful!
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SWALLOWING AND PERISTALSIS
GLOTTIS AND EPIGLOTTIS
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Peristalsis

• Rhythmic muscular contractions propel a bolus of
  food

Peristalsis Video
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Figure 41.13 The human digestive system
Intestine animation
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• Pyloric valve
• Cardiac valve
• Rugae

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Stomach Functions

• Food Storage
• Mechanical Digestion
• Chemical Digestion
• Secretions
• Mucus
• Pepsinogen
• HCL
• CHYME leaves.

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Protection from Self-Digestion

• Protective lining
• Pepsin is inactive when secreted

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Pancreas

• Secretes
• Hormones
• Sodium bicarbonate
• Digestive enzymes
• Lipase
• Trypsinogen
• Amylase

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Liver

• Secretes
• Blood clotting enzymes
• Stores glycogen
• Bile
• Stored in gall bladder
• emulsifies fat

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• Small Intestine
• a. Anatomy
• 1. size
• 2. villi
• 3. lacteals
• 4. glands
• Functions
• c. Secretions
• 1. mucus
• 2. maltase
• 3. sucrase
• 4. lactase
• 5. peptidase

Intestine animation
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Figure 41.19 The structure of the small intestine
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• 6. LARGE INTESTINE COLON
• Anatomy
• Functions
• a. Reclaim water
• b. Synthesis of vitamins by E. coli
• Feces
• Rectum
• Anus
• Diarrhea
• Constipation

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Can you name the parts and tell what they do?
B
C
A
D
F
E
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