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Nephrons

Nephrons

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...

Renal Tubule and Collecting Duct

Renal 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...

Reabsorption and Secretion in the PCT

Reabsorption 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...

Renal Corpuscle

Renal Corpuscle

The glomerulus and Bowman's capsule are two essential components of the nephron, which is the functional unit of the kidney. These microscopic structures play a critical role in the process of blood filtration to produce urine.
Glomerulus: Structure and Function
The glomerulus is a tiny, intricate network of capillaries located at the beginning of the nephron. It's enveloped by the Bowman's capsule and receives its blood supply from an afferent arteriole, which divides into numerous capillaries...

Filtration and Urine Formation

Filtration and Urine Formation

The function of the kidneys is to filter, reabsorb, secrete, and excrete. Every day the kidneys filter nearly 180 liters of blood, initially removing water and solutes but ultimately returning nearly all filtrates into circulation with the help of osmoregulatory hormones. This process removes wastes and toxins but is also crucial to maintain water and electrolyte levels. Most of these functions are performed by the tiny but numerous nephrons contained within the kidneys.

Kidney Structure

Kidney Structure

The kidneys are two large bean-shaped organs located in the upper abdomen. They filter the blood several times a day to remove toxins and rebalance water and electrolytes of the circulatory system via the renal veins. The kidneys receive blood directly from the heart via the renal arteries. These arteries enter the kidney at the hilum, the concave surface of the bean, where they branch and divide into smaller vessels and capillaries.

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Related Experiment Video

Updated: May 9, 2026

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

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

Published on: May 9, 2025

Proximal nephron.

Jia L Zhuo¹, Xiao C Li

¹Laboratory of Receptor and Signal Transduction, Department of Pharmacology and Toxicology, University of Mississippi Medical Center, Jackson, Mississippi, USA. jzhuo@umc.edu

Comprehensive Physiology

|July 31, 2013

Summary

This summary is machine-generated.

This review highlights the crucial role of kidney proximal tubules in maintaining body fluid balance and reabsorbing essential substances. It explores recent advancements in understanding their structure, function, and hormonal regulation.

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Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney

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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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Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney

Analysis of Nephron Composition and Function in the Adult Zebrafish Kidney

Published on: August 9, 2014

Area of Science:

Nephrology
Physiology
Molecular Biology

Background:

Kidney proximal tubules are vital for salt/fluid balance, blood pressure homeostasis, and reabsorbing ~65% of filtered load.
They handle reabsorption of amino acids, glucose, solutes, proteins, and ~80% of filtered bicarbonate for acid-base balance.
Proximal tubules play a more significant role than distal tubules in overall kidney function.

Purpose of the Study:

To provide a comprehensive overview of current understanding of kidney proximal tubules.
Emphasis on ultrastructure, molecular biology, cellular/integrative physiology, and signaling transduction.
To discuss recent insights into nephron classification, function, and hormonal regulation.

Main Methods:

Review of recent literature on proximal tubule structure and function.
Analysis of molecular biology, cellular physiology, and signaling pathways.
Inclusion of insights from transgenic animal models and proteomic approaches.

Main Results:

Proximal tubules are critical for reabsorbing essential filtered substances and regulating acid-base balance.
Recent research clarifies structural and biochemical underpinnings of proximal tubule function.
Vasoactive hormones significantly regulate proximal tubular transport, with new insights from molecular techniques.

Conclusions:

Kidney proximal tubules are indispensable for maintaining physiological homeostasis.
Advancements in molecular biology and physiology have deepened our understanding of their complex functions.
Future research directions include exploring nephron number roles and detailed signaling pathway analyses.