ofcells in the distal tubule, and the juxtaglomerular
cells, epithelioid cells in the media of the afferent
arterioles just as they enter the glomerulus. The juxta-
glomerular apparatus supplies blood to the GLOMERU-
LUS, controls the glomerular filtration rate (volume of
plasma filtered through the glomerulus per second),
blood pressure, and circulating volume through the
release of rennin, which activates angiotensin, a family
of peptide hormones that control blood pressure and
body fluid levels.184 juxtaglomerular apparatus