Module_1_Notes - Lecture Module 1: Introduction to...

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Lecture Module 1: Introduction to physiology. Opening screen : Physiology explores how the body functions internally and all the interaction that occur for us to live. We all might look very different from the outside but we are built essentially the same way. Our body consists of millions of very tiny units called atoms that combine to form molecules that, in turn, join together to form over 200 different kinds of complex cells that perform very specific functions. Similar types of cells cluster together to form tissues such as nervous, muscle and connective tissues. Tissues combine to form organs such as the heart, liver, muscle, skin, etc that work together as physiological systems. For example, the brain and all the nerves emerging from it is called the central nervous system and plays an important role regulating the heart, blood vessels, lungs and many other body organs. This complex internal machinery of the body operates on basically 3 types of raw materials as fuel – glucose, fatty acids and amino acids. Here you see a muscle working at the whole organ level and at the cellular level. To grasp why it works the way it does at the whole organ level we must spend time understanding how it works at the cellular level. In this course we will spend a lot of time exploring how the important cells function so that you can better understand why the whole organ system works the way it does. Click the learning objectives button: Each lecture module has learning objectives for you to accomplish. In this module there are four goals. First, we will discuss the four major cells found in the human body. These cells are surrounded by fluid inside and out. Indeed the most abundant substance in the body is water. The body’s interior is divided into compartments separated by cell membranes. As you will see, these compartments serve a special purpose and the second task of this module is to define and describe these compartments. At the very heart of body functioning is the precise control of the cell’s normal environment. Temperature, acidity and blood glucose levels, for example, are closely monitored and controlled because the body’s organs, enzymes and hormones only operate effectively within a preset range of temperature, acidity and blood sugar levels. Move the internal environment of the body outside that preset range and it will not work efficiently. The body will go to inordinate lengths to prevent this from happening. It uses regulatory mechanisms to keep conditions in the internal environment relatively constant. This maintenance of constant conditions in the internal environment is called homeostasis. Our final two goals for this module is to briefly overview homeostasis and the feedback control mechanism the body uses to maintain a regulated internal environment. Click Home Menu Button
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This note was uploaded on 04/14/2010 for the course PHYSIOLOGY 2105 taught by Professor Dobs during the Spring '10 term at University of Florida.

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Module_1_Notes - Lecture Module 1: Introduction to...

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