The primary difference in between vasa recta and also peritubular capillaries is that the vasa recta are the blood capillaries that surround the loop of Henle in the juxtamedullary nephrons. But, peritubular capillaries are the blood capillaries that surround the PCT and also DCT of the cortical nephrons. In addition, vasa recta take place in the medulla of the kidney while peritubular capillaries happen in the cortex. Besides, vasa recta serve as osmotic exchangers for the concentration of urine while peritubular capillaries supply the blood for reabsorption and secretion.  

In brief, vasa recta and also peritubular capillaries are the two kinds of blood capillaries that aclimb from efferent arterioles. Normally, they involve 2 of the four physiological attributes of the nephron: reabsorption and also secretion. 

Key Areas Covered 

1. What are Vasa Recta – Definition, Anatomy, Function2. What are Peritubular Capillaries – Definition, Anatomy, Function3. What are the Similarities Between Vasa Recta and Peritubular Capillaries – Summary of Common Features4. What is the Difference Between Vasa Recta and also Peritubular Capillaries – Comparison of Key Differences

Key Terms 

Efferent Arteriole, Loop of Henle, Nephron, Peritubular Capillaries, Vasa Recta

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What are Vasa Recta 

Vasa recta are the form of blood capillaries that arise from the efferent arterioles, bordering the loop of Henle of the juxtamedullary nephrons. Juxtamedullary nephrons only occur in the kidney of birds and also mammals and are responsible for the production of concentrated urine under high physical activity or under unfavorable environmental problems. Additionally, lengthy and straight vasa recta run parallel to the loop of Henle, which occurs in the medulla of the kidney. 




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Figure 1: Vasa Recta and Peritubular Capillaries General Anatomy


Besides, at the descending part of the vasa recta, the reabsorption of sodium chloride and also urea right into the blood occurs while secreting water right into the loop of Henle from the blood. On the contrary, at the ascending component of the vasa recta, both sodium chloride and also urea are secreted into the loop of Henle while resoaking up water. Moreover, the blood flows extremely gradually through the right blood capillaries of the vasa recta because they have actually a hairpconsequently in the medulla. This, subsequently, prevents the washing out of the concentration gradient while maintaining a countercurrent exreadjust. More importantly, the maintenance of a concentration gradient is responsible for the manufacturing of focused urine.  

What are Peritubular Capillaries 

Peritubular capillaries are the type of blood capillaries that arise from the efferent arterioles, neighboring the PCT and DCT of the cortical nephrons. Here, the loop of Henle of the cortical nephrons does not dip past the cortex of the kidney. Also, the majority of the nephrons of the kidney are cortical nephrons. In addition, cortical nephrons are responsible for the manufacturing of dilated urine under normal physiological conditions. Because of this, the main function of these capillaries is to undergo reabsorption and also secretion at the distal parts of the nephron.


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Figure 2: Nephron General Function




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Functionally, glucose, amino acids, and ions, which need to remajor in the body, undergo reabsorption via active move, additional active carry, and also transcytosis in the peritubular capillaries. However, the ions and excess water that requirements to be rerelocated from the body undergo secretion from the blood in the peritubular capillaries right into the PCT and also DCT, sfinishing them towards the bladder.  


Similarities Between Vasa Recta and Peritubular Capillaries  

Vasa recta and also peritubular capillaries are the 2 forms of blood capillaries that aclimb from the efferent arteriole.  Both of these structures provide blood to the distal components of the nephron.  Besides, they involve two of the 4 physiological features of the nephron; reabsorption and secretion. 

Difference Between Vasa Recta and also Peritubular Capillaries 

Definition 

Vasa recta describe among a series of long loops of thin-walled blood vessels, which dip down alongside the loop of Henle in the vertebprice kidney. But, peritubular capillaries refer to the tiny blood vessels supplied by the efferent arteriole, which take a trip the alongside nephrons permitting reabsorption and also secretion in between blood and the inner luguys of the nephron. 

Occurrence 

Vasa recta surround the loop of Henle in the juxtamedullary nephrons, while peritubular capillaries surround the PCT and also DCT of the cortical nephrons.  

Depth  

Furthermore, vasa recta take place in the medulla of the kidney, while peritubular capillaries happen in the cortex.  

Abundance 

Around 15% of capillaries arising from the efferent arterioles are vasa recta, while around 85% of capillaries emerging from the efferent arterioles are peritubular capillaries. 

Activity 

Vasa recta occupational during durations of high task, while peritubular capillaries occupational during normal task. 

Function 

Additionally, vasa recta serve as osmotic exchangers for the concentration of urine, while peritubular capillaries supply the blood for reabsorption and secretion.  

Importance 

Also, vasa recta only occur in the kidney of birds and mammals, enabling concentrating urine greatly in drought problems. But, peritubular capillaries are necessary in the production of dilated urine under normal problems. 

Conclusion 

In brief, vasa recta are one of the two types of blood capillaries occurring from the efferent arterioles of the nephron. They are much less numerous and also surround the loop of Henle of the juxtamedullary nephrons. Hence, they happen in the medulla of the kidney of only birds and also mammals, concentrating urine. In contrast, peritubular capillaries are the other form of blood capillaries, occurring from the efferent arterioles. They are abundant develops of such blood capillaries and also surround the PCT and also DCT of the cortical nephrons. In addition, the primary function of peritubular capillaries is to develop dilated urine under normal conditions. Therefore, the major difference between vasa recta and peritubular capillaries is their depth of incident and also function. 

References:

1. “Medical Physiology/Renal Physiology.” Medical Physiology/Renal Physiology – Wikibooks, Open Books for an Open World, Available Here.2. “Straight Arterioles of Kidney.” Wikipedia, Wikimedia Foundation, 25 Sept. 2019, Available Here.

Image Courtesy:

1. “Figure 41 03 03” By CNX OpenStax (CC BY 4.0) via Commons Wikimedia 2. “Kidney nephron molar carry diagram” By M•Komorniczak (CC BY 3.0) using Commons Wikimedia