Antibody molecules are formed by a. monocytes b. plasma cells. Macrophages in tissues originate from blood cells called a. lymphocytes. Antibody molecules are a. lipids. Serum contains a. hormones. All of the above.
Platelets a. are very tiny cells.
ALL of the above. Lymphatic vessels a. contain valves to prevent lymph backflow and to help move lymph along in the vessels. BOTH of the above are true. NONE of the above are true. Lymph flows through lymph nodes a.