NATS 1560 Chapter Notes - Chapter 1: Cobalamin, Lipoprotein, Calcification
9 Jan 2017
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Document Summary
Macronutrients: there are three major kinds of nutrients we ingest in quantity to provide our bodies with energy and raw materials: proteins, carbohydrates and. Proteins play a variety of key roles in organisms in humans for example: They provide structure: keratin is protein in the hair, while collagen is found in the skin and cartilage. Enzymes: proteins that speed up chemical reactions such as lactase which breaks down the milk sugar lactose. Hormones: molecules that stimulate chemical activity in cells some distance from where hormones were formed. Somatotrphin stimulates bone growth and fat breakdown for energy release. Muscle contraction: two proteins (actin and myosin) in muscle fibres cause them to contract. Immune system: proteins form antibodies to fight invaders. Proteins are composed of amino acids which are derived from two kinds of organic molecules, the amines (which have a functional group of nh2).
