Human Biology (BIO 100) Week 1 Class Notes
Human Biology (BIO 100) Week 1 Class Notes Biol 100
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This 4 page Class Notes was uploaded by snufkin on Saturday September 3, 2016. The Class Notes belongs to Biol 100 at San Francisco State University taught by Lynne Dowdy in Fall 2016. Since its upload, it has received 143 views. For similar materials see Human Biology in Biology at San Francisco State University.
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Date Created: 09/03/16
Biology Notes: Week 1 Characteristics of living things: 1) Highly organized layers of structure all living things are made up of atoms CHNO are elements that make up 97% of humans cells are the basic unit of life there are 200 different types of cells in the human body atom →molecule →cell →tissue →organ →organ system o →organism 2) Homeostasis (“stay the same”) process of maintaining a relatively s table internal environment ex. blood sugar, temperature, water levels when the body temperature gets too hot, the body creates fucky sweat which evaporates and cools down the body. The body fucky also redirects blood flow to the surface of the skin, the the fucky blood brings heat close to the skin to help the sweat evaporate. when the body temperature gets too cold, the body shivers; fucky this is the muscles contracting to generate heat. The body also fucky redirects blood flow to the core to keep the important organs fucky alive. Metabolic processes also slow down to conserve energy. ) Growth all living things increase in size 4) Metablosim the chemical reactions that control break down of food, growth, ormones, etc. 5) Responsiveness to stimuli how the organism reacts to different stimulants 6) Reproduction all living things make copies of themselves (pass down DNA) 7) Evolution genetic change in a population over time Scientific Method: Observations → Hypothesis → Experiment/ Results → Conclusion → Scientific Theory Good studies are blind studies, where the participants don’t know what group they are in to prevent psychological bias (ex. When testing which medicine is better, the control group is given a placebo pill a medicine that doesn’t actually do anything) Double blind studies are the best, where the scientists don’t know which participants are in what group and is kept track by a third party Studies should be done with a large sample size Studies should be repeated to make sure of the results Atoms Protons and neutrons are considered “heavy” particles, while electron are considered “light” particles Atomic number number of protons Atomic mass number of protons + number of neutrons Ion charged atom Isotope atoms with the same number of protons, but different number of neutrons (ex. Carbon 12 is the most common form of Carbon which has 6 protons and 6 neutrons, but Carbon 14 has 6 protons and 8 neutrons) Uses for Radioactive Isotopes: 1) Tracer molecules (in research) 2) Smoke detectors 3) Pacemakers (though most now run on battery) 4) Diagnose diseases for example, someone with irregular problems may have thyroid related problems. To check the thyroid, certain isotopes of Iodine may be used to diagnose thyroid malfunction. *thyroid gland located in the neck, and releases hormone (chemical messengers) that control speed of metabolism. Hormones require Iodine 5) Treat diseases for example, radiation from certain radioactive isotopes may be sed to kill cancer cells