Filtration. The process whereby some substances, but not all, pass through a filter. In a kidney, blood pressure forces materials through the filter(glomerulus) Blood passes thru the many glomeruli and the thin walls of the glomerulus (the filter) permits water, salts, sugar and urea to leave the blood stream.
Confidence votes 319K. The lead singer of the ban Evanescence is Amy Lee. Amy Lee has been the front woman of the band since the beginning and has helped lead the band to great success.
As their sound leaned more toward ballads, Cetera became the primary lead vocalist. <br /><br /> Bill Champlin took over some vocal duties after the death of Terry Kath in the late 70s, and Jason Sheff joined Chicago after Peter Cetera left to pursue his solo career in the 80s.