page_title: Collecting duct system
section_title: Segments
hierarchical_section_title: Collecting duct system / Structure / Segments
caption_attribution_description: Transverse section of pyramidal substance of kidney of pig, the blood vessels of which are injected. a. Large collecting tube, cut across, lined with cylindrical epithelium. b. Branch of collecting tube, cut across, lined with cubical epithelium. c, d. Henle’s loops cut across. e. Bloodvessels cut across. D. Connective tissue ground substance.
context_page_description: The collecting duct system of the kidney consists of a series of tubules and ducts that physically connect nephrons to a minor calyx or directly to the renal pelvis. The collecting duct system is the last part of nephron and participates in electrolyte and fluid balance through reabsorption and excretion, processes regulated by the hormones aldosterone and vasopressin.
  There are several components of the collecting duct system, including the connecting tubules, cortical collecting ducts, and medullary collecting ducts.
context_section_description: The segments of the system are as follows:
caption: Simple columnar epithelium and simple cuboidal epithelium in the collecting ducts of the pig kidney. The walls of the large and small connecting tubules (a and b respectively), the circular structures, are formed by simple columnar epithelium (a) and simple cuboidal epithelium (b).
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