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Unformatted text preview: 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 w rong path for the human lung? 2. Today: 1. exhalation 2. tidal lungs and dead air space 3. bird lungs now were 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 a lv a lv = P = P a tm a tm theres 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. its all passive 4. Elasticity of thorax and lung (surface tension and elastic fibers) size of alveoli 1. this P alv 5. When P alv > P atm air moves from alveoli to atmosphere 1. until P alv = P atm Review terms Review terms 6. Whats 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 ai rway, except for alveoli, is anatomical dead space All of ai rway, 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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This note was uploaded on 02/02/2010 for the course BIO 188 taught by Professor Capco during the Spring '08 term at ASU.
- Spring '08