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6 essential activities of digestion
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| 6 essential activities of digestion | ingestion, propulsion, mechanical digestion, chemical digestion, absorption, defecation |
| ingestion | taking food in |
| propulsion | swallowing |
| peristalsis | waves of contraction and relaxation of muscles in organ walls |
| mechanical digestion | chewing, mixing, and churning food |
| chemical digestion | catabolic breakdown of food |
| absorption | movement of nutrients from the GI tract to blood or lymph |
| defecation | elimination of indigestible solid wastes |
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