24.03.2013 Views

Lymphatic system - Elizabeth Bauer Consults

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<strong>Lymphatic</strong> System: Lymph Nodes<br />

Lymph nodes contain cavities, called sinuses,<br />

into which the lymph flows.<br />

The walls of the sinuses are lined with<br />

phagocytic cells, which engulf any foreign<br />

particles like bacteria. Tests have<br />

demonstrated that over 99% of the bacteria<br />

carried into a node are screened out before the<br />

lymph leaves the node on its return to the<br />

blood.<br />

This filtering mechanism is one of the most<br />

important body defenses against infectious<br />

disease. When combating a heavy infection, the<br />

lymph nodes enlarge producing "swollen<br />

glands."

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