GEOL 1601 Chapter : Sedimentary Rocks
Document Summary
This is not true in plants because they rely on photosynthesis for their energy needs: food energy content is measured in calories. 1 calorie = 1 kilocalorie (1000 calories): the average adult needs 1500 calories/day at rest, exercise (and mental activity) greatly boosts caloric needs. The categories of nutrients that animals consume reflect this need for energy supplying foods: 5 major categories of animal nutrients, lipids, carbohydrates, proteins, minerals, vitamins. Lipids: fats (see pages 43-45, phospholipids (left: fig 3-14, cholesterol (right: fig 3-15, fat (9 calories/gram) Lipids are a great energy source- they provide more energy/ gram than any other nutrient source. Fats also supply: certain hormones, cell components (membranes, nerve cell coverings, most fats can be synthesized, but essential fatty acids cannot and must be obtained on our diet. In humans, linoleic acid is an essential fatty acid. An omega-6 fatty acid, in safflower or corn oil. Like plants, animals require these small inorganic molecules.
