<P> In order of blood flow , the pulmonary arteries start as the pulmonary trunk or main pulmonary artery . The main pulmonary artery begins at the base of the right ventricle . It is short and wide -- approximately 5 centimetres ( 2.0 in ) in length and 3 centimetres ( 1.2 in ) in diameter . </P>
where does the pulmonary trunk receive blood from
the right ventricle