For 10 points, identify this organ containing sacs called alveoli which allow for exchange of gases.
Reduced expression of SEMA3F protein is identified with the formation of tumors in this organ. Though it is not the kidney, the hilum is the spot where nerves and other vessels enter this organ. The mediastinum separates the pleural cavities that house the left and right of these organs. The horizontal fissure is present in the right one but not the left, so the right one contains a middle lobe in addition to the superior and inferior lobes found in the left one. For 10 points, identify this organ containing sacs called alveoli which allow for exchange of gases.
Reduced expression of SEMA3F protein is identified with the formation of tumors in this organ.
{lungs}