Psychology 2036A/B Lecture Notes - Lecture 18: Vapor Pressure, Partial Pressure, Blood Gas Tension
22 May 2020
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The average energy of particles in a fluid are governed by the t. Some particles may have energy > than the avg. These can escape from the attractive forces holding the liquid together (evaporation in. T c drops - capacity of air to hold water vapour drops - ph2o drops. The > number of particles in the air, the > water vapour pressure. n in the lung). Receptors in lung are associated with increased stretch--> leads to expiration. In exercise, change is driven by chemical signals. Central chemoreceptors are not sensitive to changes of po2. Only sensitive to changes in pco2 and ph change. As you go up in altitude, partial pressure of o2 decreases in alveoli (pao2) No change in ventilation as you increase altitude (until you get to 60mmm pressure ) --> still amount of o2 via haemoglobin. Pco2 going to be stable over initial drop in o2. remembering that co2 levels are associated w.
