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animal nutrition intro bio 2
what do animals eat
herbivores |
consume mainly plants and algae |
carnivores |
consume other animals |
omnivores |
consume animals as well as plants or algae |
Digestive System
Alimentary Canal |
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mouth |
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pharynx |
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esophagus |
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stomach |
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intestine |
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anus |
accessory glands |
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salivary glands |
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liver |
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gallbladder |
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pancreas |
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essential nutrients
four class of essential nutrients |
-amino acids (~ from diet) |
-fatty acids |
-vitamins (small organic molecules) |
-minerals (small inorganic molecules) |
malnourishment |
- lack of essential nutrients |
How do animals eat?
specialized adaptations |
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dentition |
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intestinal adaptations |
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mutualistic adaptations |
Why do animals eat?
ATP needed for metabolism; generated by oxidation of glucose |
glucose levels kept in balance by pancreatic hormones |
-insulin & glucagon |
glucose is stored in liver and muscle of glycogen |
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Stages of Eating
1. ingestion |
2. digestion |
3. absorption |
high surface area |
4. elimination |
Types of Ingestion
suspension feeder |
whales- toothbrush like teeth |
bulk feeder |
humans and snakes |
substrate feeder |
caterpillar |
fluid feeder |
mosquitoes |
storage and release
overnourishment |
excess food energy; causes obesity |
diabetes, colon/breast cancer, heart attacks, strokes |
many hormones involved in ingestion/appetite |
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