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The digestive system:
provides body with nutrients, water, and minerals.
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Alimentation:
process of providing nutrition for the body
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4 main digestive activities
Ingestion, digestion, absorption, and elimination
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Ingestion (1)
oral intake of substances into body
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Digestion (2)
mechanical and chemical conversion of food into substances that are eventually absorbed by cells.
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Absorption (3)
process in which the digested food molecules pass through the lining of the small intestine into the blood or lymph capillaries.
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Elimination (4)
removal of undigested food particles and defection, elimination of waste in the form of feces.
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3 major classes of nutrients
Carbohydrates, proteins, and lipids.