What do the lymphatic system and the immune system have in common?
Which structure of the lymphatic system functions as the site of development of T lymphocytes during childhood and the preteen years, but is replaced by fat as an individual grows older?
What are the major structures involved in lymph flow?
Where is the fluid that the lymphatic system collects returned to the blood?
Which structures in the lymph vessels ensure that lymph flows in one direction?
Which is a function of the lymphatic system?
Why is it important for a young person to have a thymus?
Which is a structure of the lymphatic system?
Why do blood vessels and lymph vessels have valves?
Which is a difference between antibodies and antigens?
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