COLLECTING TUBULE

• Collecting Tubule

  
• Collecting Tubule

  ● simple cuboidal epithelium

  ● 3 regions

  = cortical

  = medullary

  = papillary
• Collecting Tubule

  ● convey & modify ultrafiltrate from nephron to minor calyces

  ● 2 types of cuboidal cells

  = ○ intercalated cells

  ■ Type A cells: secrete H+

  ■ Type B cells: secrete HCO3- and resorb H+

  = ○ principal cells

  ■ reabsorb water and Na+ and secrete K+