Bowmans casue Renat Glomerulus acting duct Efferent tubule Podocytes Sympathetic nerve fiber Mesangial cells Descending of Henle's oop Efferent arteriole cells Henle's loop Afferent arteriole Smooth muscle Macula densa Distal tubule of Henle's loop The intersection of the macula densa in the distal tubule with the afferent and efferent arterioles forms the juxtaglomerular apparatus, which secretes the endocrine signal known as renin into blood in the afferent arterioleThe intersection of the macula densa in the distal tubule with the afferent and efferent arterioles forms the juxtaglomerular apparatus, which secretes the endocrine signal known as renin into blood in the afferent arteriole