Ch. 9, word parts for the cardiovascular and lymphatic systems Tools A B cardi/o heart atri/o atrium ventricul/o cavity, ventricle valv/o, valvul/o valve angi/o vessel vas/o, vascul/o duct, vessel arter/o, arterio/o artery arteriol/o arteriole aort/o aorta ven/o, ven/i vein phleb/o vein lymph/o lymph lymphatic system lymphaden/o lymph node lymphangi/o lymphatic vessel splen/o spleen thym/o thymus gland tonsill/o tonsil