The immune system is composed of the responses by which the body neutralizes foreign agents, whether living or nonliving, as well as protects against its own cells which may be cancerous. These responses fall into two general categories. General protective mechanisms which function without prior exposure to harmful agents are classified as nonspecific defense mechanisms. Acquired immunity consists of specific immune responses directed against specific agents. Acquired immunity depends on the lymphatic system, a network of lymphatic vessels that carry a clear fluid called lymph containing lymphocytes and other white blood cells.
Mastery of immune system concepts is a major challenge for MCAT review. Study of this material should begin as early as possible in MCAT review. There is a large body of factual information and some aspects are conceptually difficult. You need multiple study cycles over the course of MCAT review to get where you need to be.
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Conceptual Vocabulary for The Lymphatic System and Immunity