It is possible to have multiple independent variables and/or multiple dependent variables. For instance, in multivariable calculus, one often encounters functions of the form, where z is a dependent variable and x and y are independent variables.
Gas exchange between the air within the alveoli and the pulmonary capillaries occurs by diffusion. The oxygen must first dissolve before passing through the respiratory epithelium. Gas moves from a region of high partial pressure to a region of low partial pressure, down a partial pressure gradient.
it is when gas particles move from a higher concentration gradient to a lower concentration gradient . for example: in the alveolus oxygen diffuses into the blood capillaries â¦from the alveolus because there is more oxygen in the alveolus compared to the blood capillaries. andkind of like diffusion.