The Lymphatic System's Role Alongside Circulation
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The lymphatic system collects fluid that leaks from capillaries, per Bio 3207, back into the bloodstream, and also transports immune cells and filters pathogens through lymph nodes along the way.
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Lymph node swelling during infection reflects immune-cell activity concentrated at that filtering point.
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Lymphatic vessels have no central pump like the heart — fluid moves mainly through surrounding muscle contraction.
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