The juxtaglomerular apparatus is a microscopic structure in the kidney, which regulates the function of each nephron. The juxtaglomerular apparatus is named for its proximity to the glomerulus: it is found between the vascular pole of the renal corpuscle and the returning Distal Convoluted Tubule of the same nephron. This location is critical to its function in regulating renal blood flow and glomerular filtration rate. The three cellular components of the apparatus are the macula densa of the distal convoluted tubule, smooth muscle cells of the afferent arteriole and juxtaglomerular cells.
Read more about Juxtaglomerular Apparatus: Cells of The Juxtaglomerular Apparatus
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“Man is the end of nature; nothing so easily organizes itself in every part of the universe as he; no moss, no lichen is so easily born; and he takes along with him and puts out from himself the whole apparatus of society and condition extempore, as an army encamps in a desert, and where all was just now blowing sand, creates a white city in an hour, a government, a market, a place for feasting, for conversation, and for love.”
—Ralph Waldo Emerson (1803–1882)