vascular smooth muscle /efferent arteriole macula densa e& extraglomerular Juxta- mesangial cell glomerular cells capillary Bowman's capsule podocyte 球旁器示意固efferent arteriole efferent arteriole Juxta￾glomerular cells vascular smooth muscle macula densa extraglomerular mesangial cell capillary podocyte Bowman’s capsule 球旁器示意图