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What is physiology? Why study human physiology? These are the two initial questions that will be answered in this class, whose main objective is to present the fundamental concepts for understanding physiology. Among these concepts, the definition of “homeostasis” or “homeostasis” should be understood by all those who wish to understand physiology. When watching the video class, try to answer the following questions: 1. What is the internal environment? 2. What is homeostasis and why is it important? 3. What are homeostatic mechanisms? 4. What are the 3 main components of a negative feedback mechanism? 5. How do negative feedback and feedforward mechanisms work? Supporting material: • For a quick review of cell biology, access the link ( • Biology: Cell Structure I Nucleus Med... ) and watch the video. This video has subtitles in Portuguese, just access the video settings.