Humans at High Altitude (Lecture 18) Flashcards
True or False: Atmospheric pressure decreases at high altitudes
True
True or False: As the barometric pressure decreases, the atmospheric oxygen partial pressure increases proportionately
False, As the barometric pressure decreases, the atmospheric oxygen partial pressure DECREASES proportionately
Alveolar PCO2 ______from sea level values of 40 mm Hg to lower values at high altitudes/
Decreases
True or False: The decrease in alveolar PCO2 in acclimated people is greater compared to unacclimilized individuals due to increased respiration
True
True or False: Acclimatized people can increase their ventilation
True
True or False: As altitude increases, the air that reaches the alveoli contains more oxygen
False, less oxygen
Why is there less oxygen at higher altitudes?
Carbon dioxide and water vapour decrease the alveolar oxygen by diluting the oxygen in the alveoli
True or False: At sea level, there is no difference in alveolar PO2 in unacclimatized and acclimatized individuals
True
True or False: At increased altitudes, the reduction in alveolar PO2 is lower in an unacclimatized person compared to an acclimatized person.
False, higher in an unacclimatized person
True or False: Alveolar ventilation increase much more in the acclimated person.
True
Up to an altitude of 10,000 feet, arterial oxygen saturation remains at least as high as ______.
90%
True or False: Above 10,000 feet, arterial oxygen saturation falls rapidly.
True
How can you aid in breathing in more oxygen at higher altitudes?
Breathing pure oxygen instead of air, fills the space in the alveoli formerly occupied by nitrogen by oxygen
What is the graph on arterial oxygen saturation and when breathing pure oxygen
Pure oxygen lasts longer before it falls off
______ occurs when oxygen levels in blood are low, less oxygen is available to the body’s tissue
Hypoxemia