A clear fluid that circulates through the lymphatic system and carries immune cells, proteins, and other substances from tissues toward the bloodstream.
Lymph forms when some fluid from the blood moves into surrounding tissues and is subsequently collected by lymphatic vessels. It can contain immune cells, proteins, cellular debris, and other substances collected from tissues.
Lymph travels through lymphatic vessels and may pass through lymph nodes, where foreign material can be filtered and immune responses initiated. Eventually, lymph is returned to the bloodstream.
QUICK FACT
Lymph begins largely as tissue fluid that enters lymphatic vessels. It is not simply another name for blood.
COMMONLY CONFUSED WITH
Lymphatic vessel: Lymph is the fluid being transported; a lymphatic vessel is the structure that carries it.
SEE ALSO