You do it this way; the shift in perspective can bewilder the reader. Consistency is the chief virtue here. There is, of course, a difference between a process essay that tells readers how to do something and a process essay that describes the process by which something gets done by someone else or by nature.here is, of course, a difference between a process essay that tells readers how to do something and a process essay that describes the process by which something gets done by someone else or by nature.
In the human heart, the pulmonary trunk (pulmonary artery or main pulmonary artery) begins at the base of the right ventricle. It is short and wideâapproximately 5 centimetres (2.0 in) in length and 3 centimetres (1.2 in) in diameter.
Answer by Andrew Lardie. Confidence votes 8. The pulmonary artery is the blood vessel that leads away from the heart (Artery=Away), toward the lungs. It is pumping blood to that lungs that just returned from the body (via the vena cava, into the right atrium).So the blood in the pulmonary artery has the lowest concentration of O2 and the highest concentration of CO2. It is just about to pick up lots of oxygen, once it gets to the lungs.t is pumping blood to that lungs that just returned from the body (via the vena cava, into the right atrium). So the blood in the pulmonary artery has the lowest concentration of O2 and the highest concentration of CO2.