Which term is used for the maximum rate of lymph transport when the system is at maximum activity?

• A. Lymph time volume
• B. Transport capacity
• C. Filtration
• D. Edema

Answer: (B)

Transport capacity is the maximum rate at which the lymphatic system can move lymph when its pumping mechanisms are fully activated. It represents the functional limit of the lymph collectors and valves; when stimulation pushes flow to this limit, a large amount of lymph can be cleared. If lymph production or interstitial fluid filtration exceeds this rate, the excess accumulates, leading to edema. Other terms describe different ideas—for example, lymph time volume refers to how much lymph can be held within the system at a given moment, filtration is about fluid moving from blood vessels into tissues, and edema is the fluid buildup that occurs when transport capacity is exceeded.