Lecture 2 Cell Chemisty - Lecture 2 Cell Chemistry 1....

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Lecture 2 Cell Chemistry 1. Elements (fig. 2-1) Humans are a bag of chemicals, and many of the things that happen within us happen as a result of those chemicals’ properties Substances that cannot be broken down into simpler substances by ordinary chemical reactions Substances that are composed of one type of atom Over 100 elements a. Macronutrients the same as a microelement Organism uses it in large amounts 1. Oxygen (65% of human body weight) - Humans are carbon-based organisms, but oxygen is the most abundant - Humans are mostly water (70-75%) - Fresh Weight (if you weigh something while it still has water in it) - Human’s fresh weight is mostly water - Dry Weight (water removed) 2. Carbon (18%) 3. Hydrogen (9.5) 4. Nitrogen (3.5) - (4 m ain ele m ents in organic che micals, in hu m ans) - In all a nim als, sulfur would b e included b. Micronutrients -microele m ent, or trace ele m ent - Copper (Cu)
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- Helps some of our enzymes to work (some enzymes need a  metal attached to it to carry a charge or electron that allows the  enzyme to work (protein portion and metal portion) - Iodine (I 2 ) -Important for thyroid to function, without it, thyroid becomes  enlarged (goiter) - main source of iodine is from salt (iodized) - Iron (Fe)
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This note was uploaded on 05/30/2008 for the course BS 130 taught by Professor Smith during the Fall '07 term at University of the Sciences in Philadelphia.

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Lecture 2 Cell Chemisty - Lecture 2 Cell Chemistry 1....

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