Lymphology Association of North America (LANA) Practice Exam

What is the average contraction rate of lymph vessels?

1. 1-5x per minute

2. 25x per minute

3. 6-10x per minute

4. More than 25x per minute

The correct answer is: 6-10x per minute

The average contraction rate of lymph vessels is indeed typically around 6 to 10 times per minute. This range reflects the normal physiological function of lymphatic vessels, which continuously contract to help facilitate the movement of lymph fluid through the lymphatic system. These contractions are essential for the proper functioning of the lymphatic system, as they help promote lymph drainage, prevent fluid accumulation in tissues, and maintain fluid balance within the body. The lymphatic system relies on a series of smooth muscle contractions to propel lymph forward, working in tandem with factors like muscle contraction, gravity, and breathing movements that assist in lymph flow. In contrast, a contraction rate of 1-5 times per minute would be considered too low, potentially indicating compromised lymphatic function. A rate of 25 times per minute or more would be unusually high and not representative of typical lymph vessel activity, as such rates are more common in the cardiovascular system rather than in lymphatic vessels.