The mammalian diving reflex causes this organ to contract more than 20 percent (20[1]0[1])in volume. Macrophages in this organ (20[1]0[2])phagocytose (“FAY-goh-SIGH-toes”) pneumo·cocci and other encapsulated (0[1])bacteria. (0[5])The majority (20[1])of the (0[1])body’s IgM (“I-G-M”) is made in this organ rather than at a germinal center. (0[1])This organ is the body’s reservoir of iron (20[1])before hematopoiesis (0[1])(“huh-MAT-oh-poh-EE-sis”), which occurs both here (0[2])and in the bone marrow. (20[1])After (0[1])120 days of circulation, (20[1])sickled or old (20[1])(*) erythrocytes (10[2])get (10[1])stuck in this organ’s (10[1]0[1])cords. (10[2])Mononucleosis causes this organ (0[1])to (10[1])enlarge (10[1])until it ruptures (10[1])or is surgically (10[1])removed. (0[2])This organ’s (0[1])marginal zone divides (0[1])red and white blood cells into two colored (0[1])pulps. For 10 points, name this (10[1])large organ of the lymphatic system (10[1])found in the upper left abdomen. (10[4])■END■ (10[6]0[2])