introduction to digestionsciencewithhanes.weebly.com/uploads/2/...digestion... · introduction to...
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Introduction to Digestion
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A 5 We are learning to demonstrate an understanding of animal anatomy and physiology of the digestive system.
Success Criteria: I can…
- use appropriate terminology related to animal anatomy
- explain the anatomy of the digestive system
-identify disorders of the digestive system
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heterotrophs - organisms that need to eat food to obtain nutrients
(Autotrophs ---> produce their own food)
-digestive system breaks down large complex molecules into smaller components that cell can use
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4 stages of digestion:
1. ingestion - the taking in of nutrients 2. digestion - breakdown of complex organic
molecules into small components
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• mechanical digestion - physically breaking down food stuff
•chemical digestion - breaking the bonds that hold large complex molecules together to smaller components
Vs.
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3. absorption - the transport of nutrients to tissues – nutrients need to be small enough to be transported
into cells 4 egestion - the removal of waste from materials
– first from individual cells, then from body
4 stages of digestion (cont’d):
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Digestion in Simpler Organismsinternal digestion
• cells engulf food ---> vacuole ---> lysosomes digest particles (phagocytosis)
eg: amoeba
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Digestion in More Complex
OrganismsGastrovascular cavity digestion - Digestive sac with 1 opening - Food digests and is absorbed by a cells lining a
cavity eg: hydra, planaria
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Digestion in more complex Organisms
Gastrointestinal Tract - = (digestive tube) - Mouth --> specialized region for digestion--> anus