Mesangial Cells Help Keep the Basement Membrane Clean by

Multiple Choice

Mesangial cells help keep the basement membrane clean by

A) secreting emulsifying agents that dissolve trapped particles.
B) engulfing macromolecules caught in its basement membrane.
C) opening larger pores in the membrane so that trapped particles move across.
D) secreting antibodies that attack the molecules caught in the endothelium.