Question

multiple choice question
how is fluid that is not reabsorbed by blood capillaries returned to blood?

by muscle contraction
by the heart
by the lymphatic system

Explanation:

The lymphatic system's function includes collecting interstitial fluid (fluid not reabsorbed by blood capillaries) and returning it to the bloodstream. Muscle contraction aids lymph movement but isn't the main return system, and the heart doesn't directly return this unabsorbed fluid.

Answer:

C. By the lymphatic system (assuming the options are labeled A, B, C as: A. By muscle contraction, B. By the heart, C. By the lymphatic system)