The rate at which lymph angions contract is referred to as?

• A. Lymphatic velocity
• B. Angion permeability
• C. Lymphatic pumping rate
• D. Lymphangiomotoricity

Answer: (D)

Lymphangiomotoricity refers to the rhythmic, intrinsic contractile activity of lymphangions, the segments of lymphatic vessels that propel lymph forward. The rate at which these angions contract is essentially the motor activity driving lymph propulsion, so describing it as lymphangiomotoricity captures both the muscular contraction and its frequency. The other terms don’t fit: velocity describes how fast the lymph moves, not how often the walls contract; permeability relates to what fluid can pass through the vessel walls; and pumping rate is not the standard term used to denote the intrinsic contractile rhythm of lymphatic vessels.