lymph is tissue fluid that has entered a capillary

Question

 this is for anatomy

Answer 1

This statement is not correct. Lymph is tissue fluid (or interstitial fluid) that has entered a lymphatic vessel, which is part of the lymphatic system.

This begs the question, "Where does tissue fluid come from?" Tissue fluid is what is filtered out of the capillary and into and around the tissues.

So, to recap, blood exits the heart, flows through the arteries until they become microscopic capillaries. Once there, fluid, along with oxygen and nutrients, all filter out into the interstitial space (space around cells), and then diffuse into the actual cells. Then, waste products and CO2 diffuse out of cells, into interstitial fluid and then into the venous capillaries to return to the lungs. However, it has been estimated that only 80% of the fluid returns that way, while the other 20% moves from the interstitial space to the lymphatic system. The lymphatic system eventually drains back into the central venous system in the chest (via the Thoracic duct and another duct).

I hope that helps!