Animal nutrition Everyone’s gotta eat The big picture Autotrophy vs. heterotrophy Why do we need...
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Transcript of Animal nutrition Everyone’s gotta eat The big picture Autotrophy vs. heterotrophy Why do we need...
![Page 1: Animal nutrition Everyone’s gotta eat The big picture Autotrophy vs. heterotrophy Why do we need food? –Use as fuel for cellular work –Form important.](https://reader030.fdocuments.us/reader030/viewer/2022032607/56649ec85503460f94bd4537/html5/thumbnails/1.jpg)
Animal nutritionEveryone’s gotta eat
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The big picture• Autotrophy vs.
heterotrophy• Why do we need
food?– Use as fuel for cellular
work– Form important
molecules– Supply essential ‘pre-
made’ nutrients
Fig. 40.10
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Fuel
• Nearly all ATP derived from oxidation of organic molecules
– Protein– Carbohydrate– Fats
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Raw Materials
• Raw materials for biosynthesis of carbohydrates, lipids and proteins
C
H
O
N
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Essential Nutrients
• Stuff we can’t synthesize
Vitamins
Essential Amino Acids
Minerals
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Essential amino acids
• Humans cannot synthesize 8 of the 20 AA’s needed to make proteins; they are also difficult to store
• Can lead to protein deficiency, especially in infants
• Best sources of AA’s?– Meat, eggs, fish, cheese
• What if animal protein is not available?
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Vitamins• Organic molecules required in very
small amounts• 13 are essential to humans• Solubility Influences overdosage concerns– Water soluble: B-complex, C– Fat soluble: A, D, E
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Essential nutrients• Animals missing essential nutrients in their diet are
malnourished (vs. undernourished—not enough calories)
• Minerals: simple inorganic nutrients required in small amounts
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You Are What You Eat?
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You Are What You Eat, Sort of
• Most animals digest (break down) what they eat and use the components to resynthesize the macromolecules they need.
• Why not just absorb whole proteins?
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You’re not really what you eat: different feeding modes
• Saprophytes• Herbivores• Carnivores• Omnivores• Parasites
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Stages of feeding
• Ingestion– Initial introduction of food to digestive system
• Mechanical Digestion– Make big chunks into small chunks.
• Chemical Digestion– Break down molecules into units small enough to absorb
(hydrolysis via enzymes)
• Absorption– Active or passive transport
• Elimination– of undigested material– Not “excretion,” which has a different meaning in physiology
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Food processing overview
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Ingestion adaptations
• Diet vs. dentition
Fig. 41.20
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Digestion in humans
Fig. 41.13
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Down the hatch• Salivary amylase hydrolyzes starch
Fig. 41.14
PeristalsisNot swallowing
Swallowing
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Digestion in the stomach
• Storage and preliminary digestion
• Gastric juice has a pH of 2
• Pepsin hydrolyzes protein
• Result: acid chyme
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Digestion in the duodenum
• A whole lot of digestion going on
Fig. 41.16
Enzymes +bicarbonate
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Digestion
• What, with what, where, how?• Why don’t you digest yourself?
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p887
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Stages of feeding
• Ingestion– Initial introduction of food to digestive system
• Digestion– Break down molecules into units small enough to
absorb, mechanically and chemically (hydrolysis)
• Absorption– Active or passive transport
• Elimination– of undigested material– Not “excretion,” which has a different meaning in
physiology
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Small intestine structure• Increasing surface area for what?
Fig. 41.19
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Absorption in the large intestine
• Water recovery, minerals, vitamin K
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Digestion adaptations
• Diet vs. alimentary canal
Fig. 41.21
Coyote Koala
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Rumination• Ruminant digestion
Fig. 41.22
Symbioticprokaryotes &protists
Cud reentry;Absorbs H20
Cud digestion