Anatomy/Lymphatic System

The lymphatic system is a focus topic of the event Anatomy and Physiology. It is expected to rotate in for the 2019 season.

Overview
The lymphatic system is a network of vessels and nodes that transports lymph throughout the body. It is closely connected with immunity, as lymph is a fluid that contains white blood cells and helps the body fight off infection. Lymph is stored in clumps of tissue called lymph nodes. There are primary and secondary lymph organs including the thymus, spleen, and more.

The Lymphatic System
Unlike the cardiovascular system, the lymphatic system is a one-way system. The lymph vessels do not form a complete circuit between the lymph organs, and lymph is not "pumped" like blood. The lymphatic system also lacks arteries. However, lymphatic and blood vessels both have the same three tunicas, and valves to prevent backflow. Lymph is moved by contractions of skeletal muscle and other body movements.