Nephrons The kidney consists of over a million individual filtering units called nephrons . Each nephron consists of a filtering body, the renal corpuscle, and a urine-collecting and concentrating tube, the renal tubule. The renal corpuscle is an assemblage of two structures, the glomerular capillaries and the glomerular capsule, shown in Figure 1. • The glomerulus is a dense ball of capillaries (glomerular capillaries) that branches from the afferent arteriole that enters the nephron. Because blood in the glomerular capillaries is under high pressure, substances in the blood that are small enough to pass through the pores (fenestrae, or endothelial fenestrations) in the capillary walls are forced out and into the encircling glomerular capsule. The glomerular capillaries merge, and the remaining blood exits the glomerular capsule through the efferent arteriole.
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