Question

what is the major difference between lymph and tissue fluid (interstitial fluid)?
a lymph contains plasma proteins; tissue fluid does not.
b tissue fluid contains more white blood cells than lymph.
c their location: lymph is in lymphatic vessels, tissue fluid is in the tissues, between tissue cells.
d lymph is found only in lymphatic organs like lymph nodes; tissue fluid is found in the lymphatic vessels.

Explanation:

Lymph is the fluid within lymphatic vessels. Tissue fluid (interstitial fluid) is the fluid between tissue cells in the tissues. Plasma proteins are mainly in blood plasma, not a major difference here. Lymph has more white blood cells than tissue fluid. And lymph is in lymphatic vessels (not only organs like lymph nodes) while tissue fluid is in tissues (not lymphatic vessels).

Answer:

C. Their location: lymph is in lymphatic vessels, tissue fluid is in the tissues, between tissue cells.