The partial pressure of oxygen always moves towards areas of lesser oxygen in the body to establish equilibrium. This is the system by which organisms are able to take oxygen to where it is needed. When a breath is inhaled, the partial pressure is at its highest. In mammilian systems, the lungs take oxygen through a universal pool of oxygen and other gasses. Oxygen is then trasported into the bloodstream, where the partial pressure of oxygen is significantly lower than the partial pressure of oxygen found in the inhaled breath. This causes the oxygen to diffuse into the blood stream where it is transported throughout the body. Cells that are oxygen-deprived pick up oxygen from red blood cells that will eventually return to the lungs. The blood returning to the lungs have the least partial pressure of oxygen because it has released the oxygen, and the blood leaving from the lungs will have a higher partial pressure where oxygen is received.
Comments
I am not sure what the
I am not sure what the paragraph is about.
comment
Not much context as to what the paragraph is essentially discussing. I could assume you are writing about the gas exchange occuring within our respiratory system. I would give some background information so that readers now the applicability and the importance.
You should definitely include
You should definitely include some background information as well as some kind of introduction to what you are writing about.