Related Experiment Video
Updated: Aug 7, 2026
06:11
Culturing Primary Rat Inner Medullary Collecting Duct Cells
Published on: June 21, 2013
Relationship between structure and function in distal tubule and collecting duct
K M Madsen1, J W Verlander, C C Tisher
1Laboratory of Experimental Morphology, University of Florida College of Medicine, Gainesville 32610-0224.
Journal of Electron Microscopy Technique
|June 1, 1988
Summary
Morphometric analysis reveals distinct cell populations in the kidney's distal nephron, linking structure to function in sodium chloride reabsorption and ion secretion.
Area of Science:
- Nephrology
- Cell Biology
- Physiology
Background:
- The distal nephron, comprising the distal tubule and collecting duct, plays a crucial role in regulating kidney function.
- Understanding the structure-function relationship is key to comprehending renal physiology and disease.
Purpose of the Study:
- To elucidate the relationship between the structure and function of the distal nephron.
- To identify functionally distinct cell populations using morphometric analysis.
Main Methods:
- Morphometric analysis
- Physiologic techniques
- Micropuncture and microperfusion studies
Main Results:
- Identified distinct cell populations in the distal tubule and collecting duct.
- Linked specific cell types (principal cells, intercalated cells) to functions like sodium chloride reabsorption, potassium secretion, and hydrogen ion secretion.
- Highlighted species differences in the connecting tubule (CNT).
Conclusions:
- Morphometric analysis is a valuable tool for understanding the structure-function relationship in the distal nephron.
- Specific cell types and segments are critical for key renal transport processes.
Related Concept Videos
01:10Nephrons
The kidneys are intricate organs with millions of working units known as nephrons. Each nephron features two major structures: the renal corpuscle, which facilitates blood plasma filtration, and the renal tubule, which handles the glomerular filtrate. Blood supply is directly linked to the nephrons. The renal corpuscle consists of the glomerulus, a capillary network, and the Bowman's capsule, a double-walled epithelial structure that encases the glomerulus. The filtering of blood plasma happens...
01:24Renal Tubule and Collecting Duct
The renal tubule is divided into three parts: the proximal convoluted tubule (PCT), the Loop of Henle (LOH), and the distal convoluted tubule (DCT).
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
Proximal Convoluted Tubule (PCT):
The PCT is the initial segment of the renal tubule, extending from the Bowman's capsule that encloses the glomerulus. Its convoluted structure and microvilli-lined cells increase the surface area for reabsorption. The PCT reabsorbs glucose, amino acids, sodium, and water from the filtrate, ensuring essential...
01:28Tubular Reabsorption and Secretion
Tubular secretion and reabsorption are two critical processes in the nephron tubule of the kidneys. When the fluid filtered from the glomerulus enters the proximal convoluted tubule, it is referred to as filtrate, and its composition changes due to tubular reabsorption and secretion.
Tubular reabsorption is a selective process that starts when the filtrate enters the proximal tubules. It involves substances traveling through the transcellular route (through the tubule cell and peritubular...
Tubular reabsorption is a selective process that starts when the filtrate enters the proximal tubules. It involves substances traveling through the transcellular route (through the tubule cell and peritubular...
01:28Reabsorption and Secretion in the PCT
The Proximal Convoluted Tubule, or PCT, plays a pivotal role in the body's filtration system. They are primarily responsible for reabsorbing solutes and water from the filtered fluid produced by the glomeruli. Most of the filtered water, ions, and organic solutes such as glucose and amino acids are reabsorbed by the PCT.
Transport mechanisms involving sodium ions (Na+) contribute significantly to solute reabsorption. These mechanisms include symport and antiport processes.
A key example is the...
Transport mechanisms involving sodium ions (Na+) contribute significantly to solute reabsorption. These mechanisms include symport and antiport processes.
A key example is the...
01:26Reabsorption and Secretion in the DCT and Collecting Duct
The early phase of the DCT manages the reabsorption of approximately 10-15% of filtered water, 5–10% of filtered sodium, and 5–10% of filtered chloride. This process is facilitated by Na+–Cl− symporters in apical membranes and sodium-potassium pumps, as well as Cl− leakage channels in basolateral membranes. The early DCT also stands out as a site where parathyroid hormone (PTH) stimulates calcium reabsorption, depending on the body's requirements.
The distal part of the DCT, along with the...
The distal part of the DCT, along with the...
01:22Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion
The kidneys maintain homeostasis through filtration, reabsorption, and secretion. Tubular reabsorption and secretion are crucial in forming urine and regulating electrolytes, water balance, and waste elimination.Tubular Reabsorption and Secretion ProcessesTubular reabsorption is the process that reclaims essential substances such as electrolytes, glucose, amino acids, and water from the glomerular filtrate back into the bloodstream. This is achieved through passive and active transport...