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BIO188_outline_Nov30

BIO188_outline_Nov30 - B IO 188 1 Read art icle posted on...

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BIO 188 November 30, 2009 BIO 188 November 30, 2009 1. Read article posted on BB for exam: West, J. (2006) Did evolution go the wrong path for the human lung? 2. Today: 1. exhalation 2. tidal lungs and dead air space 3. bird lungs – now we’re talking 4. gas exchange 5. hemoglobin and O 2 transport 6. O 2 – Hb dissociation curve Make your own diagram sequence of events in inhalation! Make your own diagram sequence of events in inhalation! After inhalation, what happens? After inhalation, what happens? 3. Air moves into alveoli until …. ? 1. … until air pressure in alveoli = pressure of atmosphere 1. P alv = P atm 2. if P if P alv = P = P atm there’s no movement of air 3. no driving force (pressure gradient) What happens to cause exhalation to occur? 4. Phrenic nerve stops firing, so inspiratory muscles relax 5. it’s all passive 4. Elasticity of thorax and lung (surface tension and elastic fibers) ñ size of alveoli 1. this P alv 5. When P alv > P atm air moves from alveoli to atmosphere
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1. until P alv = P atm Review terms Review terms 6. What’s tidal volume? 7. What is anatomical dead space? 8. What is residual volume? 9. Does residual volume keeps lungs from collapsing? 1. Whadaya think would happen to surface tension if residual volume could be made zero? All of airway, except for alveoli, is anatomical dead space All of airway, except for alveoli, is anatomical dead space What is physiological consequence of anatomical dead space and residual volume in tidal What is physiological consequence of anatomical dead space and residual volume in tidal lung?
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