USI BIOL 121 Final Exam Review

What is the order of the six levels of organization? correct answer: chemical level, cell level, tissue level, organ level, organ system level, organism level Homeostasis definition correct answer: State of equilibrium in the body with respect to functions and composition of fluids and tissues. Set point (Homeostasis) correct answer: The ideal normal value of a variable. Such as, for temperature, the set point is 98.6 degrees What are the types of feedback systems? correct answer: Negative and positive What are the components of a feedback system? correct answer: 1. Receptor (monitors the value of some variable) 2. Control center (establishes the set point) 3. Effector (can change the value of the variable) Negative feedback definition correct answer: Negative means that any deviation from the set point is made smaller or is resisted; therefore, in a negative-feedback mechanism, the response to the original stimulus results in deviation from the set point, becoming smaller. Negative feedback example correct answer: Your temperature gets to 100, your body responds, it goes back down to 98.6 Others: temperature, BP, Heart rate, blood pH, blood sugar Positive feedback definition correct answer: When a deviation occurs, the response is to make the deviation greater Positive feedback examples correct answer: Child birth, milk producing, blood clotting Proton correct answer: 1 positive charge Neutron correct answer: No electrical charge Electron correct answer: 1 negative charge what makes up atoms? correct answer: Protons, neutrons, and electrons What particles make up the nucleus? correct answer: protons and neutrons Cation correct answer: Positively charged ion Anion correct answer: Negatively charged ion Ion correct answer: an atom loses or gains electrons