Cuvierian tubules: clusters of sticky tubules located at the base of the respiratory tree, which may be discharged by somesea cucumbers (holothurians) when mechanically stimulated (i.e. being threatened by a predator)[5]
Distal convoluted tubule: the convoluted portion of the vertebratenephron that lies between the loop of Henle and the nonsecretory part of thenephron and that is concerned especially with the concentration ofurine[3]
Loop of Henle: the long U-shaped part of the renal tubule, extending through the medulla from the end of theproximal convoluted tubule. It begins with a descending limb (comprising the proximal straight tubule and the thin tubule ), followed by the ascending limb (the distal straight tubule ), and ending at thedistal convoluted tubule[2]
Renal tubule: the minute canals made up ofbasement membrane and lined withepithelium, composing the substance of thekidney and secreting, reabsorbing, collecting and conducting theurine. Include proximal convoluted, the nephron loop (containing the proximal straight tubule, descending and ascending thin, and the distal straight tubules) and thedistal convoluted tubules[4]
T tubule: transverseintracellular tubules invaginating from thecell membrane and surrounding themyofibrils of the T system of skeletal and cardiac muscle, serving as a pathway for the spread of electrical excitation within amuscle cell
