Biology 2601A/B Lecture 15: Digestion
13 Nov 2017
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Food in--> work out: processed in gut, absorbed across gut epithelia, transported to cells or storage, atp to run cellular processes. Inefficiently packaged nutrient molecules: micronutrients: vitamins, minerals, absorbed as is. Lips, carbohydrates, proteins: broken into smaller bits and absorbed in animal, vitamins are essential because we cant synthesize them ourselves. Some are broken down at all-- why we poop. Sunbird: live on diet of simple sugars, disaccharides, sucks out nectar, cellular metabolism. Zebra: high protein source of food, gorilla, eating diet of plant stems, protein, mineral, lips, eat a lot of plant material, do a lot of farting. First step to digestion: birds- different shapes and sizes of beaks. Post-mouth physical processing: butterfly, sucking juice out of plants, beetles, chew, adaptation of mouth parts for different kinds of food, mammal skulls rage from versatile omnivores to carnivores, evolution of structure of mouthpart is to get the food.
