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Lymphatic System is a part of Circulatory System and the Immune System of humans.

Lymphatic System mainly consists of lymph, lymphatic vessels, lymphatic capillaries and lymphatic nodes.

Lymph is a type of fluid connective tissue (Blood is the main fluid connective tissue) that is pale and colourless. When exchange of materials takes place between cells and blood capillaries, some amount of blood oozes through blood capillaries and collects in the intercellular spaces. This blood is now called lymph.

Lymph is pale, colourless, and contains less proteins compared to that of blood.

Lymph is collected by small tube like structures called Lymphatic Capillaries, which join together to form bigger vessels called Lymph Vessels.

Lymph Vessels return the lymph to blood circulation through the Venacava Of Heart. 

Also, there are certain enlargements seen in the lymph vessels at certain intervals. These enlargements are called Lymph nodes. They contain cells called Lymphocytes, which destroy any foreign substance present in lymph.