Partial Pressure. Primary determinant of diffusion and direction Describes the pressure of a particular gas within a mixture Equals the total pressure times the fractional concentration of the particular gas, according to Whose Law?. Partial Pressure. Concentration of gases in ambient air
Alveolar Air Percentages and Partial Pressures differ from Ambient Air and Tracheal Air
Humidification reduces pressure of gasses
Oxygen is constantly leaving alveoli in capillaries
Some residual air is always left in alveolus in each breath to mix with new air.
Oxygen moves from alveoli into blood down concentration gradient (104 mm Hg to 40 mm Hg.
Carbon dioxide moves from blood into alveoli down concentration gradient (46 – 40 mm Hg).
Carbon dioxide produced in cells moves from higher pressure to lower pressure into blood.
if 100% saturated.
Arteriovenous O2 difference