How does lymph flow through its vessels?

Lymph is under no pressure to move toward the heart, kind of like blood in veins. You'll be happy to know that all the same methods for getting blood back to the heart in veins apply in lymphatic vessels and trunks. The major method is contraction of skeletal muscles, followed by pressure changes during breathing.

The larger lymphatic trunks can even constrict from smooth muscle contraction in their walls, but the smaller lymphatic vessels lack any muscle. In addition, lymphatic vessels and trunks contain one-way valves within them, preventing any backflow of lymph. Your book points out that during exercise, when skeletal muscles are really working and breathing is rapid, is the best time for getting lymph back into the blood.

Now consider when a person is stuck in bed, unable to leave bedrest for extended periods. Can you picture how little lymph is drawn back up toward the heart? As the lymphatic system fills with lymph, more fluid will only enter the lymphatic capillaries if it is ... more.

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