Is collecting duct a part of renal tubule?
With respect to the renal corpuscle, the connecting tubule (CNT, or junctional tubule, or arcuate renal tubule) is the most proximal part of the collecting duct system. It is adjacent to the distal convoluted tubule, the most distal segment of the renal tubule.
Table of Contents
What is the collecting duct in the kidney?
The last part of a long, twisting tube that collects urine from the nephrons (cellular structures in the kidney that filter blood and form urine) and moves it into the renal pelvis and ureters. Also called renal collecting tubule.
What is the collecting duct responsible for?
The functions of the collecting tubes are transportation of urine and absorption of water. It is thought that the tissue of the kidney’s medulla, or inner substance, contains a high concentration of sodium.
What is the collecting duct made of?
The collecting ducts are composed of two cell types: principal and intercalated cells. Principal or light cells are the most numerous and are characterized by a pale cytoplasm with sparse organelles. Principal cells increase in size from the cortex to the medulla and are largest in the papillary ducts.
What is reabsorbed in the collecting duct?
Water Reabsorption in the Collecting Duct The main role of the collecting duct is the reabsorption of water, through the action of anti-diuretic hormone (ADH) and aquaporins. ADH is produced in the hypothalamus, and stored in the posterior pituitary gland until it is released.
What is reabsorbed in collecting duct?
What substances are reabsorbed in collecting duct?
Learning Objectives
| Table 1. Substances Secreted or Reabsorbed in the Nephron and Their Locations | ||
|---|---|---|
| Substance | PCT | Collecting ducts |
| Potassium | 65 percent reabsorbed; diffusion | Secretion controlled by aldosterone; active |
| Calcium | Reabsorbed; diffusion | Reabsorbed if parathyroid hormone present; active |
| Magnesium | Reabsorbed; diffusion |
What is the fluid entering the collecting tubules called?
The initial collecting tubules merge into the collecting duct, which traverses the cortex and medulla to the papillary tip, where the tubule fluid (urine) discharges into the renal pelvis.
Does secretion occur in the collecting duct?
Tubular secretion occurs throughout the different parts of the nephron, from the proximal convoluted tubule to the collecting duct at the end of the nephron.