14.4- The Lymphatic System Quiz Please sign up for the course before taking this quiz. Lymph circulation is driven primarily by1 gravity the massaging effect of surrounding muscles lymphatic drainage therapy the massaging effect of the surrounding cardiovascular system the heart The walls of lymph nodes are highly permeable.1 True False Lymph nodes swell due to lack of exercise.1 True False Lymph flows more slowly than blood.1 True False Macrophages, lymphocytes and T-Cells are found in high concentration in lymph nodes.1 True False Lymph is initially distributed to body tissues via the subclavian veins.1 True False Lymph is pale, interstitial fluid.1 True False