ANP 1105 Chapter 22: Respiratory System Physiology pt 2

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Joanne Savory

Document Summary

Anp1105 a dr. joanne savory and dr. m zeroual. At high altitude, atmosphere is less influenced by gravity, so partial pressures decline in direct proportion to the decrease in atmospheric pressure. Below sea level, atmospheric pressure increases by 1 atmosphere (760 mmhg) for every 33 ft down in water; partial pressures increase accordingly. Alveolar gas composition different than atmospheric (o2 and n2); more co2, h2o, and less o2 b/c: In lungs o2 diffuses from the alveoli into pulmonary blood and co2 from blood to air in lungs. Conducting passageways have humidified the air (water vapour) Alveolar gas and atmospheric gas are mixed with every breath: gas in alveoli is a mix of newly inspired gas with remaining gases in respiratory passageways btwn breaths. Increase depth and rate of breathing increase partial pressures of o2 and decreases co2 (chart on p825) Higher avr (more air) brings more o2 to the alveoli and eliminates more co2 from lungs.