The Respiratory System

at a Glance

Jeremy Ward, Jane Ward and Richard Leach

Multiple Choice: Chapter 4 Gas laws

Question 4.1. Fractional concentration of oxygen in the air

a reduces progressively with increasing altitude
b multiplied by barometric pressure gives the partial pressure of oxygen in the air
c is about 0.78 (= 78%) at sea level
d divided by barometric pressure gives the partial pressure of oxygen in the air.