Like veins, the larger lymphatic vessels contain
Correct answer: D. valves that keep the lymph moving in one direction
- A. thick muscular walls like arteries
- B. red blood cells
- C. pacemakers
- D. valves that keep the lymph moving in one direction
Explanation
Lymph flows under very low pressure, so valves prevent backflow while surrounding muscle contractions squeeze it onwards. This one way design is why lymphoedema develops when the vessels are blocked.
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