A and P question

The human body is approximately 75% fluid and these are all body fluids but given different names in different locations! Serum is the liquid that separates from clotted blood (lacks the substances used in the clotting process)
Plasma is the fluid in the blood vessels, in which blood cells are suspended (also includes blood clotting factors and other substances). Lymph is fluid within the lymphatic system (derived from fluid that bathes tissues). Tissue fluid is found outside of the blood and lymph circulation - it bathes cells of the body. Tissue fluid is essentially plasma that squeezes our through capillary walls carrying oxygen and nutrients to the tissues of the body. Some re-enters the capillaries to become plasma again and some enters the lymphatic capillaries where it is called lymph (lymphatic vessels have larger pores than blood capillaries and so can take in waste that is too large to enter blood capillaries). After the lymph is cleansed in the lymph nodes it all re-enters the bloodstream via the subclavian veins to become plasma again! So it is all the same fluid but just given different names depending on where it happens to be found! Hope this helps.