If you clench your hand into a fist, this is approximately the same size as your heart ... the left ventricle and another where the pulmonary artery leaves the right ventricle.
All vessels feature varying lumen size. The lumen is the hollow opening ... the heart (usually oxygenated blood, except for the pulmonary artery) Carry blood towards the heart (usually ...
A pulmonary embolism is a blood clot in the pulmonary artery, which carries blood from ... These aim to reduce the size of the blood in the lungs and prevent new ones from forming.