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Fluid leaks out of the thin walled capillaries as they pass through the tissues. This is called
tissue fluid
.
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Much of tissue fluid passes back into the capillaries. Some enters the blind-ended lymphatic capillaries that form a network between the cells of the tissues. This fluid is called
lymph
.
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Lymph flows from the
lymphatic capillaries
to
lymph vessels
, passing through
lymph nodes
and along the thoracic duct to join the blood system.
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Lymph nodes filter the lymph and produce
lymphocytes
.
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Other organs of the lymphatic system are the
spleen, thymus, bone marrow
, and
lymph nodules
.