Final answer:
Lymph flow is not aided by the heartbeat but by skeletal muscle contractions, body movements, and breathing, with the help of one-way valves.
Step-by-step explanation:
The statement that lymph flow is aided by heartbeat is false. The lymphatic system differs from the cardiovascular system in that it does not have a central pump like the heart. Instead, lymph is moved through its network of vessels by the contraction of skeletal muscles, body movements, and breathing. The presence of one-way valves, such as semi-lunar valves, in lymphatic vessels ensures that lymph continuously moves toward the heart. Although during systole, blood enters various vessels and indirectly influences lymph movement, it is not the heartbeat that directly propels lymph through the lymphatic system.