What_You_Should_Have_Gotten_Out_of_the_R

What_You_Should_Have_Gotten_Out_of_the_R - What You Should...

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What You Should Have Gotten Out of the Respiratory Physiology Lecture or Learning Objectives for the Respiratory Physiology Lecture There are several steps in external respiration. External respiration supplies the oxygen needed for internal respiration and gets rid of the carbon dioxide produced by internal respiration. 1. Describe the respiratory system, include the conducting zone and the respiratory zone. Define/describe internal and external respiration and understand the steps of external respiration. Understand where O 2 /CO 2 is lowest/highest. Intrapleural fluid acts as a lubricant. The pressure of this fluid is below the pressure inside the lungs. This across the lung wall difference in pressure (transpulmonary pressure) holds the lungs open, keeps them from collapsing. If this across the wall gradient (transpulmonary pressure) is lost, the lungs will collapse. 2. Describe the arrangement of the layers of the pleura and the location and function of intrapleural fluid. Describe pleurisy (and how pleurisy shows the importance of normally working layers of the pleura). 3. Understand the 2 balloon model and why pulling on the outer balloon causes the inner balloon to follow the outer balloon. (Hint: what happens to the pressure of the fluid outside the inner balloon when you pull on the outer balloon?) Apply the 2 balloon model to the body. (What does the outer balloon, inner balloon, and fluid represent?) Define/describe transpulmonary pressure. What happens in development that causes a decrease in the intrapleural fluid pressure? / Why are the lungs always stretched to some degree? What’s the intrapleural fluid pressure (between breaths) in mmHg? Understand that this intrapleural pressure “holds the lungs open” and what happens to the intrapleural pressure / lungs when the chest pulls out. 4. Describe the collapsing force within the lungs (the effect of elastic tissue in the lungs and surface tension in the fluid lining the lungs). Understand why the lungs don’t normally collapse. (Hint: collapse of the lung is prevented by the ______________ pressure). Define pneumothorax and understand how it can occur. Surfactant is produced by Type II cells in the lungs and is very important in increasing lung compliance or stretchability (by decreasing surface tension). 5. Understand the effects of surface tension in the alveoli. (Hint: alveoli “want to” _______ and alveoli ________ stretch). Describe Type II and Type I alveolar cells. Describe surfactant. Describe lung compliance (include an equation). Understand the effect of surfactant on lung compliance.
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This note was uploaded on 03/18/2008 for the course PSL 250 taught by Professor Denison during the Spring '08 term at Michigan State University.

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What_You_Should_Have_Gotten_Out_of_the_R - What You Should...

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