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WHAT YOU SHOULD KNOW Here are some guidelines to help you succed in the Physiology course. Success, in my opinion, means that you have learned Physiology. The aim of my course is for you do just that! And if you know Physiology you should do well in the course examinations. But my aim is, and so should yours be, to understand and know physiological mechanisms, not simply earn a good grade in the exams. I hope your acquired knowledge remains well past the exams, so don’t memorize any more than you should. Understand, think, and it will remain with you. A NATOMY & H ISTOLOGY : The basic components of the airways (conducting zone) and alveoli (respiratory zone). The pleural cavity formed by the parietal (wall-attached) and visceral (lung-attached). Most important: the role of pleural fluid and the mechanisms by which the intrapleural pressure is lower than the atmospheric pressure. The sites of greatest resistance to air flow (Poiseulle’s Law) and the velocity of air in different parts of the respiratory system – Bernouilli’s Principle - (fastest where the cross-sectional area is small, where flow is laminar or turbulent bulk flow, and slowest when the cross-sectional area is large, where flow is so slow that gas moves mainly by diffusion, as in terminal bronchioles and alveoli). Cells in the airway mucosa: goblet cells that secrete mucus and ciliated cells that move mucus to the pharynx. What they do and what may make them work too much (mucus secretion) or inhibit them (ciliated cells). The elastic properties of the thoracic wall (tending to expand) and the lung tissue (tending to recoil) that cause the low intrapleural cavity pressure. The different respiratory muscles. What they do and how they do it. Know the inspiratory and expiratory muscles and when they contract or relax during respiratory cycles. Alveolar cells: which participate in gas exchange and which secrete lung surfactant. E QUATIONS : You should know all the equations discussed in the course, their important variable parameters, and be able to calculate the required results from a given set of data. You should also know which equation to use to solve a particular problem.
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  • Spring '06
  • Nefzi
  • high altitude, physiological mechanisms, alveolar gas equation, different respiratory muscles, different respiratory states

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