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BIO30S 3 1 Id Primary Metabolic Wastes
BIO30S 3 1 Id Primary Metabolic Wastes
BIO30S 3 1 Id Primary Metabolic Wastes
BIO30S 3 1 Id Primary Metabolic Wastes
BIO30S 3 1 Id Primary Metabolic Wastes
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BIO30S 3 1 Id Primary Metabolic Wastes


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  • 1. Entry slip: None Unit 3 – Excretion and Waste Management Lesson 3.1- Identify the primary metabolic wastes produced in the cell and the human body and the source of each. (pp374-375) of Biology-McGraw-Hill Ryerson) I. Terms: a.Excretion: the process of discharging waste matter from the blood, tissues and organs. i. Occurs by respiration (breathing out). ii. Occurs by urination.
  • 2. b. Metabolism: the collective term for all the chemical reactions that occur inside the cells of our body. c. Metabolic Waste: the by-products of chemical reactions in the body that need to be excreted or else the build-up of these compounds will sicken and eventually kill the person. II. Primary Metabolic Wastes: a. Carbon Dioxide (CO2): i. A by-product of the oxidation of CHO’s and lipids for energy: A. Ex C6H1206(glucose) + O2  H2O + CO2 ii. The water is not a waste; we need it as a nutrient iii. The CO2 is excreted by respiration (see Unit 2: Respiration) b.Urea:
  • 3. i. From the de-aminization of excess amino acids in the liver (see Lesson 1.7). ii. The nitrogen is converted in the liver to urea, a compound which is mildly toxic. This means that as long as it is excreted regularly and does not build up in the body, it will not sicken you. iii. Excreted by urination. c. Uric Acid: i. From the break-down of DNA and RNA of old dead cells all over the body. A. DNA and RNA are very long chains of amino acids which are like instruction manuals for your cells. Information stored in the DNA and RNA tell the cells what to do, the same way information stored on the drives of computer (software) instructs
  • 4. your computer on how to perform. B. Because DNA and RNA are composed of amino acids, they contain N, which has to be removed when the old cells die off. ii. Mildly toxic. iii. Excreted by urination. d.Creatinine: i. From the breakdown of Creatine. A. Made up of amino acids (N again!) B. Part of the process of chemical reaction that allow your muscles to move. ii. Mildly toxic. iii. Excreted by urination. III. Assignment:
  • 5. a. You are Sheriff Homeostasis of the Human Body Police Services and there are some primary metabolic wastes that you have to drive out of town. Make up an all- points-bulletin for each suspect so your deputies will have descriptions to look out for. Include any known aliases (names), their histories, where in town they may be found and how they should be driven out. b.Due the next day.