Feb_4_NUTRITION_AND_DIGESTION

Feb_4_NUTRITION_AND_DIGESTION - The cells lining the...

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NUTRITION AND DIGESTION Suspension feeders: o Extracts food particles suspended in the surrounding water. (example-humpback whale, clams, oysters) Substrate feeders: o Live in or on their food source and eat their way through it (example: arthworms) Fluid feeders: o Obtain food by sucking nutrient rich fluids from a living host, either a plant or animal. Bulk feeders: o Injest large pieces of food Four stages of food processing: o Ingestion: The act of eating o Digestion:. Breaking down food into molecules small enough for the body to absorb Mechanically broken down (teeth) Chemically broken down (hydrolysis) o Absorption:
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Unformatted text preview: The cells lining the digestive tract take up (absorb) the products of digestion-small molecules like amino acids and simple sugars. The nutrients then travel through the blood to the body cells o Elimination: Undigested material passes out of the digestive tract Digestive Compartments: o Gastrovascular cavity (single-openining->mouth) o Aliminary canal (two openings->mouth, anus Peristalis: process that moves food from the pharynx to the stomach by alternating waves of muscle contraction and relaxation Sphincters: regulate the passage of food into and out of the stomach...
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