Explore the intricacies of the lymphatic system in this 15-minute biology lecture. Delve into the differences between primary and secondary lymphatic organs, understand the structure and function of lymphatic vessels, and examine the role of kidney-shaped lymph nodes in the immune system. Learn essential concepts in immunology applicable to MCAT, DAT, NCLEX, NEET, and USMLE exams. Building on previous discussions of Major Histocompatibility Complex (MHC) and Human Leukocytic Antigen (HLA), gain a comprehensive understanding of this crucial component of the immune system.