Trace a red blood cell on a continuous route from the heart to the left lower subcostal muscle, then back to the heart, then to the lesser curvature of the stomach at its pyloric end, then back to the heart, then to the left testis, then back to the heart, then to the sigmoid colon, then back to the heart, then to the inferior aspect of the rectus abdominis muscle, then back to the heart, then to the left lobar bronchus, and finally back to the heart. there are no blockages so your trace must traverse normal pathways of flow. your trace must consist of a columnar list of the vessels through which the red blood cell passes as it moves to and from each of these structures. you do not need to list the structures of the heart in the trace, nor do you have to write arterioles, capillaries, venules, except when you pass through the liver.