Biology / Unit 13 Bio 3217 short lesson, about 20 seconds
The Lymphatic System's Role Alongside Circulation
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The idea
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.
In practice
Lymph node swelling during infection reflects immune-cell activity concentrated at that filtering point.
Where people slip
Lymphatic vessels have no central pump like the heart — fluid moves mainly through surrounding muscle contraction.
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