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Related Concept Videos

Renal Tubule and Collecting Duct01:24

Renal Tubule and Collecting Duct

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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...
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Reabsorption and Secretion in the DCT and Collecting Duct01:26

Reabsorption and Secretion in the DCT and Collecting Duct

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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...
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Reabsorption and Secretion in the PCT01:28

Reabsorption and Secretion in the PCT

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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...
4.9K
Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion01:22

Physiology of the Genitourinary System II: Tubular Reabsorption and Secretion

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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...
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Tubular Reabsorption and Secretion01:28

Tubular Reabsorption and Secretion

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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...
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Nephrons01:10

Nephrons

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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...
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Related Experiment Video

Updated: Apr 18, 2026

Isolation of Primary Human Proximal Tubule Epithelial Cells and Their Use in Creating a Microphysiological Model of the Renal Proximal Tubule
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Isolation of Primary Human Proximal Tubule Epithelial Cells and Their Use in Creating a Microphysiological Model of the Renal Proximal Tubule

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Distal convoluted tubule.

James A McCormick1, David H Ellison

  • 1Division of Nephrology & Hypertension, Oregon Health & Science University, & VA Medical Center, Portland, Oregon, United States.

Comprehensive Physiology
|January 16, 2015
PubMed
Summary

The distal convoluted tubule (DCT) regulates body fluid and electrolytes. Genetic diseases affecting the DCT reveal its crucial role in ion transport and homeostasis.

Area of Science:

  • Nephrology
  • Physiology
  • Molecular Biology

Background:

  • The distal convoluted tubule (DCT) is a vital nephron segment for regulating extracellular fluid volume and electrolyte balance.
  • DCT cells are characterized by abundant mitochondria and high Na+/K+-ATPase density, facilitating active transport.
  • These cells are crucial for sodium, chloride, and magnesium reabsorption through specific channels and transporters.

Purpose of the Study:

  • To provide a comprehensive overview of distal convoluted tubule (DCT) physiology.
  • To discuss the channels and transporters involved in DCT function.
  • To highlight the insights gained from genetic diseases affecting the DCT.

Main Methods:

  • Review of early studies on ion transport rates in the DCT.

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  • Analysis of channels and transporters identified through molecular cloning.
  • Examination of regulatory mechanisms, including hormonal and neural influences.
  • Integration of findings from human genetic diseases impacting DCT function.

    • Main Results:

    • The DCT reabsorbs sodium and chloride via electroneutral pathways, notably the thiazide-sensitive sodium chloride cotransporter.
    • Magnesium reabsorption predominantly occurs through the transient receptor potential channel (TRPM6).
    • Genetic disorders like Gitelman syndrome and EAST syndrome underscore the DCT's role in electrolyte homeostasis.
    • The DCT is a key target for hormones like angiotensin II and aldosterone, and responds to neural and potassium levels.

    Conclusions:

    • The DCT plays a critical role in maintaining electrolyte balance and fluid homeostasis.
    • Understanding DCT transport mechanisms, influenced by genetic factors and hormones, is essential for comprehending kidney function.
    • Further research into DCT physiology, informed by genetic insights, is crucial for therapeutic advancements.