Below are correct statements comparing blood, tissue fluid and lymph in a capillary bed. • W lacks large plasma proteins and red blood cells and has a higher water potential than Z. • X is at a lower pressure than Y and contains red blood cells and large plasma proteins. • Y is at a higher pressure than W and contains red blood cells and large plasma proteins. • Z is at a lower pressure than Y and lacks red blood cells. Which correctly identifies W, X, Y and Z?