FNN 100 Chapter Notes - Chapter 3.1: Testicle, Endocrine System, Inta

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Describe the organization of life from atoms to organisms. The old adage that you are what you eat is not literally true, but biochemically it is a fact. The food we eat provides all of the energy we need to stay alive and active and all the raw materials we need to build and maintain our body structures and synthesize regulatory molecules. To be useful to us, the food we eat must be broken into smaller components, absorbed into the body, and then converted into forms that can be used. Our bodies and the food we eat, like all matter on earth, are made of units called atoms. Atoms cannot be further broken down by chemical means. Carbon, hydrogen, oxygen, and nitrogen are the most abundant elements in our bodies and in the foods we eat. These atoms can be linked by forces called chemical bonds to form molecules (figure 3. 1 and appendix i).

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